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Coordinates: Sky map 08h 36m 23.0163s, −30° 02′ 15.442″
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{{Short description|Star in the constellation Pyxis}}
{{Starbox short
{{Distinguish|HD 73526}}
| name = [[Henry Draper catalogue|HD]] 73256
{{Starbox begin}}
| epoch = J2000.0
{{Starbox observe
| constell = [[Pyxis]]
| epoch = J2000.0
| ra = {{RA|08|36|23.0155}}
| constell = [[Pyxis]]
| dec = {{DEC|−30|02|15.456}}
| ra = {{RA|08|36|23.01654}}<ref name=GaiaDR3/>
| appmag_v = 8.08
| dec = {{DEC|−30|02|15.4462}}<ref name=GaiaDR3/>
| dist_ly = 119
| appmag_v = 8.08<ref name=Anderson_Francis_2012/>
| dist_pc = 36.5
}}
| spectral = G8/K0V
{{Starbox character
| names = [[Variable star designation|CS Pyxis]], [[Durchmusterung|CD]]–29° 6456, [[Hipparcos catalogue|HIP]] 42214, [[Luyten Two-Tenths catalogue|LTT]] 3183, [[New Luyten Two-Tenths catalogue|NLTT]] 19894, [[Smithsonian Astrophysical Observatory catalogue|SAO]] 176159
| type =
| Simbad = HD+73256
| class = {{nowrap|G8 IV-V Fe+0.5}}<ref name=Gray_et_al_2006/>
| EPE = HD+73256
| b-v = {{val|0.782|0.002}}<ref name=Anderson_Francis_2012/>
| u-b =
| variable = [[BY Draconis variable|BY Dra]]<ref name=Samus_et_al_2017/>
}}
{{Starbox astrometry
| radial_v = {{val|29.66|0.14}}<ref name=GaiaDR3/>
| prop_mo_ra = {{val|−182.193|(17)}}
| prop_mo_dec = {{val|67.373|(21)}}
| pm_footnote = <ref name=GaiaDR3/>
| parallax = 27.2441
| p_error = 0.0217
| parallax_footnote = <ref name=GaiaDR3/>
| absmag_v = 5.20<ref name=Anderson_Francis_2012/>
}}
{{Starbox detail
| source = <ref name="Bonfanti2015"/>
| mass = {{val|1.01|0.03}}
| radius = {{val|0.94|0.02}}
| luminosity = {{val|0.74|0.01}}
| gravity = {{val|4.49|0.03}}
| temperature = {{val|5532|36|fmt=commas}}
| metal_fe = {{val|0.29|0.05}}<ref name="Udry2003"/>
| rotation =
| rotational_velocity = {{val|3.22|0.32}}<ref name="Udry2003"/>
| age_gyr = {{val|2.5|2.3}}
}}
{{Starbox catalog
| names = {{odlist | V=CS Pyx | CD=−29°6456 | HD=73256 | HIP=42214 | SAO=176159 }}<ref name=SIMBAD/>
}}
}}
{{Starbox reference
| Simbad = HD+73256
}}
{{Starbox end}}


'''HD 73256''' is a [[variable star]] in the southern [[constellation]] of [[Pyxis]]. It has the [[variable star designation]] '''CS Pyxidis'''. With a baseline [[apparent visual magnitude]] of 8.08,<ref name=Anderson_Francis_2012/> it requires [[binoculars]] or a small telescope to view. The star is located at a distance of 120&nbsp;[[light year]]s from the [[Sun]] based on [[stellar parallax|parallax]],<ref name=GaiaDR3/> and is drifting further away with a [[radial velocity]] of +30&nbsp;km/s.<ref name=Anderson_Francis_2012/>
'''HD 73256''' is a [[star]] located approximately 119 [[light year]]s away in the [[constellation]] [[Pyxis]]. The [[spectral type]] is G9V with a quarter more [[mass]] than the [[Sun]].

The [[stellar classification]] of this star is G8IV-VFe+0.5, which suggests a slightly evolved [[G-type main-sequence star]] with a mild overabundance of iron in the spectrum. It is a [[BY Draconis variable]] with a period of 13.97&nbsp;days, showing a variation of 0.03 in magnitude due to [[chromospheric activity]].<ref name=Samus_et_al_2017/> The star appears overluminous for its class, which may be the result of a high [[metallicity]].<ref name="Udry2003"/> The star has roughly the same mass and a slightly smaller radius as the Sun, but is radiating 74% of the Sun's luminosity.<ref name="Bonfanti2015"/> It is around 2–3&nbsp;billion years old and is spinning with a [[projected rotational velocity]] of 3.2&nbsp;km/s.<ref name="Udry2003"/>

==Planetary system==
In 2003, S. Udry and colleagues reported the discovery of a planet in orbit around HD 73256 using data from the [[CORALIE spectrograph]]. This object is a [[hot Jupiter]] with at least 1.87 times the [[mass of Jupiter]] in an orbit with a period of 2.55&nbsp;days.<ref name="Udry2003"/> Assuming the planet is perfectly grey with no greenhouse or tidal effects, and a Bond albedo of 0.1, the temperature would be about 1300 [[Kelvin|K]]. This is close to [[51 Pegasi b]]; between the predicted temperatures of [[HD 189733 b]] and [[HD 209458 b]] (1180-1392K), before they were measured. It is a candidate for "near-infrared characterisation with the VLTI Spectro-Imager".<ref>{{cite journal |doi=10.1117/12.790494 |journal=Proceedings of SPIE |date=2008 |last1=Renard |first1=Stéphanie |last2=Absil |first2=Olivier |last3=Berger |first3=Jean-Philippe |last4=Bonfils |first4=Xavier |last5=Forveille |first5=Thierry |last6=Malbet |first6=Fabien | title=Prospects for near-infrared characterisation of hot Jupiters with the VLTI Spectro-Imager (VSI) |series=Optical and Infrared Interferometry |volume=7013 |pages=70132Z–70132Z–10 |arxiv=0807.3014 |url=http://orbi.ulg.ac.be/bitstream/2268/30158/1/SPIE_poster.pdf |bibcode=2008SPIE.7013E..2ZR |s2cid=119268109 }}</ref>

In 2018, K. Ment and colleagues reported an attempt to confirm the existence of this planet using Keck/HIRES data, but were unable to do so despite a likelihood of success. Thus the existence of this object is disputed.<ref name=Ment_et_al_2018/>

In 2023, a different substellar companion on a wide orbit, likely a [[brown dwarf]], was discovered using both radial velocity and [[astrometry]]. This study did also detect HD 73256 b, but did not update its parameters or address the dispute.<ref name="Philipot2023"/>


{{OrbitboxPlanet begin
{{OrbitboxPlanet begin
| table_ref = <ref name="Udry2003"/><ref name="Philipot2023"/>
| table_ref = <ref>{{cite journal | url=http://www.aanda.org/articles/aa/full/2003/32/aa3857/aa3857.html | title=The CORALIE survey for southern extra-solar planets X. A Hot Jupiter orbiting HD 73256 | author=Udry ''et al.'' | journal=[[Astronomy and Astrophysics]] | volume=407 | issue=2 | pages=679–684 | year=2003 | doi=10.1051/0004-6361:20030815 | last2=Mayor | first2=M. | last3=Clausen | first3=J. V. | last4=Freyhammer | first4=L. M. | last5=Helt | first5=B. E. | last6=Lovis | first6=C. | last7=Naef | first7=D. | last8=Olsen | first8=E. H. | last9=Pepe | first9=F. | bibcode=2003A&A...407..679U|arxiv = astro-ph/0304248 }}</ref>}}
}}
{{OrbitboxPlanet hypothetical
| exoplanet = b
| mass = >1.87 ± 0.49
| period = 2.54858 ± 0.00016
| semimajor = 0.037
| eccentricity = 0.029 ± 0.02
| status = disputed
}}
{{OrbitboxPlanet
{{OrbitboxPlanet
| exoplanet = [[HD 73256 b|b]]
| exoplanet = c
| mass = >1.87 ± 0.49
| mass = {{val|16|1}}
| period = 2.54858 ± 0.00016
| period = {{val|2690|60|102}}
| semimajor = 0.037
| semimajor = {{val|3.8|0.1}}
| eccentricity = 0.029 ± 0.02
| eccentricity = {{val|0.16|0.07}}
| inclination = {{val|29|5|3}} or {{val|152|8|7}}
}}
}}
{{Orbitbox end}}
{{Orbitbox end}}
Line 32: Line 83:


==References==
==References==
{{Reflist}}
{{Reflist|refs=


<ref name=GaiaDR3>{{Cite Gaia DR3|5643762781311698048}}</ref>
== External links ==
* {{cite web | url=http://www.extrasolar.net/planettour.asp?StarCatId=normal&StarId=204 | title=HD 73256 | work=Extrasolar Visions}}
{{Sky|08|36|23.0155|-|30|02|15.456|119}}


<ref name=SIMBAD>{{cite simbad
[[Category:G-type main sequence stars]]
| title=HD 73256 | access-date=2020-11-28 }}</ref>
[[Category:Henry Draper Catalogue objects|073256]]
[[Category:HIP objects|042214]]
[[Category:Pyxis constellation]]
[[Category:Planetary systems]]


<ref name=Anderson_Francis_2012>{{cite journal
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| title=XHIP: An extended hipparcos compilation
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>


<ref name=Samus_et_al_2017>{{cite journal
{{main-star-stub}}
| display-authors=1 | last1=Samus | first1=N. N.
| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| title=General Catalogue of Variable Stars
| version=5.1 | journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | s2cid=125853869
| doi=10.1134/S1063772917010085 }}</ref>


<ref name=Gray_et_al_2006>{{cite journal
[[de:HD 73256]]
| title=Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample
[[es:HD 73256]]
| last1=Gray | first1=R. O. | last2=Corbally | first2=C. J.
[[fa:اچ‌دی ۷۳۲۵۶]]
| last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T.
[[ja:HD 73256]]
| last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E.
[[pt:HD 73256]]
| last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R.
[[sk:HD 73256]]
| display-authors=1 | journal=[[The Astronomical Journal]]
| volume=132 | issue=1 | pages=161–170 | date=July 2006
| bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770
| doi=10.1086/504637 | s2cid=119476992 }}</ref>

<ref name="Bonfanti2015">{{cite journal
| title=Revising the ages of planet-hosting stars
| url=http://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html
| last1=Bonfanti | first1=A. | last2=Ortolani | first2=S.
| last3=Piotto | first3=G. | last4=Nascimbeni | first4=V.
| display-authors=1 | journal=Astronomy and Astrophysics
| year=2015 | volume=575 | at=A18
| arxiv=1411.4302 | bibcode=2015A&A...575A..18B
| doi=10.1051/0004-6361/201424951 | s2cid=54555839 }}</ref>

<ref name="Udry2003">{{cite journal
| url=http://www.aanda.org/articles/aa/full/2003/32/aa3857/aa3857.html
| title=The CORALIE survey for southern extra-solar planets X. A Hot Jupiter orbiting HD 73256
| last1=Udry | first1=S. | last2=Mayor | first2=M.
| last3=Clausen | first3=J. V. | last4=Freyhammer | first4=L. M.
| last5=Helt | first5=B. E. | last6=Lovis | first6=C.
| last7=Naef | first7=D. | last8=Olsen | first8=E. H.
| last9=Pepe | first9=F. | display-authors=1
| journal=Astronomy and Astrophysics
| volume=407 | issue=2 | pages=679–684 | year=2003
| arxiv=astro-ph/0304248 | bibcode=2003A&A...407..679U
| doi=10.1051/0004-6361:20030815 | s2cid=118889984 }}</ref>

<ref name=Ment_et_al_2018>{{cite journal
| title=Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810
| display-authors=1 | last1=Ment | first1=Kristo
| last2=Fischer | first2=Debra A. | last3=Bakos | first3=Gaspar
| last4=Howard | first4=Andrew W. | last5=Isaacson | first5=Howard
| journal=The Astronomical Journal
| volume=156 | issue=5 | id=213 | pages=45 | date=November 2018
| arxiv=1809.01228 | bibcode=2018AJ....156..213M
| doi=10.3847/1538-3881/aae1f5 | s2cid=119243619 | doi-access=free }}</ref>

<ref name="Philipot2023">{{cite journal |last1=Philipot |first1=F. |last2=Lagrange |first2=A.-M. |display-authors=etal |date=August 2023 |title=Multi techniques approach to identify and/or constrain radial velocity sub-stellar companions |journal=[[Astronomy & Astrophysics]] |volume= |issue= |pages= |doi= 10.1051/0004-6361/202346612|arxiv=2308.05417|s2cid=260775968 }}</ref>

}}

{{Sky|08|36|23.0163|-|30|02|15.442|120}}
{{Stars of Pyxis}}
<!-- Properties -->
{{DEFAULTSORT:HD 73256}}
[[Category:G-type main-sequence stars]]
[[Category:G-type subgiants]]
[[Category:Hypothetical planetary systems]]
[[Category:BY Draconis variables]]
<!-- Identifiers -->
[[Category:Pyxis]]
[[Category:Durchmusterung objects|CD-29 06456]]
[[Category:Henry Draper Catalogue objects|073256]]
[[Category:Hipparcos objects|042214]]
[[Category:Objects with variable star designations|Pyxidis, CS]]

Latest revision as of 00:07, 28 November 2023

Not to be confused with HD 73526.
HD 73256
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pyxis
Right ascension 08h 36m 23.01654s[1]
Declination −30° 02′ 15.4462″[1]
Apparent magnitude (V) 8.08[2]
Characteristics
Spectral type G8 IV-V Fe+0.5[3]
B−V color index 0.782±0.002[2]
Variable type BY Dra[4]
Astrometry
Radial velocity (Rv)29.66±0.14[1] km/s
Proper motion (μ) RA: −182.193(17) mas/yr[1]
Dec.: 67.373(21) mas/yr[1]
Parallax (π)27.2441 ± 0.0217 mas[1]
Distance119.72 ± 0.10 ly
(36.71 ± 0.03 pc)
Absolute magnitude (MV)5.20[2]
Details[5]
Mass1.01±0.03 M☉
Radius0.94±0.02 R☉
Luminosity0.74±0.01 L☉
Surface gravity (log g)4.49±0.03 cgs
Temperature5,532±36 K
Metallicity [Fe/H]0.29±0.05[6] dex
Rotational velocity (v sin i)3.22±0.32[6] km/s
Age2.5±2.3 Gyr
Other designations
CS Pyx, CD−29°6456, HD 73256, HIP 42214, SAO 176159[7]
Database references
SIMBADdata

HD 73256 is a variable star in the southern constellation of Pyxis. It has the variable star designation CS Pyxidis. With a baseline apparent visual magnitude of 8.08,[2] it requires binoculars or a small telescope to view. The star is located at a distance of 120 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +30 km/s.[2]

The stellar classification of this star is G8IV-VFe+0.5, which suggests a slightly evolved G-type main-sequence star with a mild overabundance of iron in the spectrum. It is a BY Draconis variable with a period of 13.97 days, showing a variation of 0.03 in magnitude due to chromospheric activity.[4] The star appears overluminous for its class, which may be the result of a high metallicity.[6] The star has roughly the same mass and a slightly smaller radius as the Sun, but is radiating 74% of the Sun's luminosity.[5] It is around 2–3 billion years old and is spinning with a projected rotational velocity of 3.2 km/s.[6]

Planetary system

[edit]

In 2003, S. Udry and colleagues reported the discovery of a planet in orbit around HD 73256 using data from the CORALIE spectrograph. This object is a hot Jupiter with at least 1.87 times the mass of Jupiter in an orbit with a period of 2.55 days.[6] Assuming the planet is perfectly grey with no greenhouse or tidal effects, and a Bond albedo of 0.1, the temperature would be about 1300 K. This is close to 51 Pegasi b; between the predicted temperatures of HD 189733 b and HD 209458 b (1180-1392K), before they were measured. It is a candidate for "near-infrared characterisation with the VLTI Spectro-Imager".[8]

In 2018, K. Ment and colleagues reported an attempt to confirm the existence of this planet using Keck/HIRES data, but were unable to do so despite a likelihood of success. Thus the existence of this object is disputed.[9]

In 2023, a different substellar companion on a wide orbit, likely a brown dwarf, was discovered using both radial velocity and astrometry. This study did also detect HD 73256 b, but did not update its parameters or address the dispute.[10]

The HD 73256 planetary system[6][10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b (disputed) >1.87 ± 0.49 MJ 0.037 2.54858 ± 0.00016 0.029 ± 0.02 — —
c 16±1 MJ 3.8±0.1 2690+60
−102 		0.16±0.07 29+5
−3 or 152+8
−7° 		—

See also

[edit]

References

[edit]
  1. ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. ^ Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
  4. ^ a b Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  5. ^ a b Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
  6. ^ a b c d e f Udry, S.; et al. (2003). "The CORALIE survey for southern extra-solar planets X. A Hot Jupiter orbiting HD 73256". Astronomy and Astrophysics. 407 (2): 679–684. arXiv:astro-ph/0304248. Bibcode:2003A&A...407..679U. doi:10.1051/0004-6361:20030815. S2CID 118889984.
  7. ^ "HD 73256". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-11-28.
  8. ^ Renard, Stéphanie; Absil, Olivier; Berger, Jean-Philippe; Bonfils, Xavier; Forveille, Thierry; Malbet, Fabien (2008). "Prospects for near-infrared characterisation of hot Jupiters with the VLTI Spectro-Imager (VSI)" (PDF). Proceedings of SPIE. Optical and Infrared Interferometry. 7013: 70132Z–70132Z–10. arXiv:0807.3014. Bibcode:2008SPIE.7013E..2ZR. doi:10.1117/12.790494. S2CID 119268109.
  9. ^ Ment, Kristo; et al. (November 2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal. 156 (5): 45. arXiv:1809.01228. Bibcode:2018AJ....156..213M. doi:10.3847/1538-3881/aae1f5. S2CID 119243619. 213.
  10. ^ a b Philipot, F.; Lagrange, A.-M.; et al. (August 2023). "Multi techniques approach to identify and/or constrain radial velocity sub-stellar companions". Astronomy & Astrophysics. arXiv:2308.05417. doi:10.1051/0004-6361/202346612. S2CID 260775968.


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