HD 131496

HD 131496 is an evolved subgiant star in the constellation Boötes. With an apparent visual magnitude of 7.9 it is too faint to be visible to the naked eye. Stars like HD 131496 are sometimes referred to as "retired A-stars", since they would have been A-type stars while on the main sequence. This name is most commonly used in connection with the search for extrasolar planets, where they are useful because these evolved stars are cooler and have more spectral lines than their main sequence counterparts, making planet detection easier.[4]

"Arcalís" redirects here. For other uses, see Arcalis (disambiguation).
HD 131496 / Arcalís
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 53m 23.0283[1]s
Declination +18° 14′ 07.471″[1]
Apparent magnitude (V) 7.96[2]
Characteristics
Evolutionary stage subgiant[2]
Spectral type K0[3]
B−V color index 1.04
Astrometry
Radial velocity (Rv)1.36±0.16[1] km/s
Proper motion (μ) RA: 43.702[1] mas/yr
Dec.: -34.116[1] mas/yr
Parallax (π)7.5565 ± 0.0658 mas[1]
Distance432 ± 4 ly
(132 ± 1 pc)
Absolute magnitude (MV)2.8[2]
Details[2]
Mass1.61±0.11 M☉
Radius4.3±0.1 R☉
Luminosity9.8±0.5 L☉
Surface gravity (log g)3.3±0.06 cgs
Temperature4927±44 K
Metallicity [Fe/H]0.25±0.03 dex
Rotational velocity (v sin i)0.48±0.5 km/s
Age2.7±0.5 Gyr
Other designations
Arcalís, BD+18°2957, HD 131496, HIP 72845, SAO 101274
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

Planetary system

A planet with a mass roughly 2.2 times that of Jupiter orbiting at a distance of 2.09 astronomical units (AU) once every 883 days was discovered in 2011.[2]

HD 131496 and its planet, HD 131496b, were chosen as part of the 2019 NameExoWorlds campaign organised by the International Astronomical Union, which assigned each country a star and planet to be named. HD 131496 was assigned to Andorra. The winning proposal for the name of the star was Arcalís, after a mountain peak in northern Andorra where the Sun shines through a gap twice a year at fixed dates, leading to its use as a primitive Solar calendar. The planet was named Madriu, after a glacial valley and river in southeastern Andorra that forms the major part of the Madriu-Perafita-Claror UNESCO world heritage site.[5]

The HD 131496 planetary system[6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Madriu ≥2.2±0.2 MJ 2.09±0.07 883±29 0.163±0.073 — —

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Johnson, John Asher; Clanton, Christian; Howard, Andrew W.; Bowler, Brendan P.; Henry, Gregory W.; Marcy, Geoffrey W.; Crepp, Justin R.; Endl, Michael; Cochran, William D.; MacQueen, Phillip J.; Wright, Jason T. (2011). "Retired A Stars and Their Companions. VII. 18 New Jovian Planets". The Astrophysical Journal Supplement Series. 197 (2): 26. arXiv:1108.4205. Bibcode:2011ApJS..197...26J. doi:10.1088/0067-0049/197/2/26. hdl:2152/42985. ISSN 0067-0049. S2CID 15088371.
  3. Cannon, A. J.; Pickering, E. C. (1993). "VizieR Online Data Catalog: Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)". VizieR On-line Data Catalog. Bibcode:1993yCat.3135....0C.
  4. Johnson, John Asher; Fischer, Debra A.; Marcy, Geoffrey W.; Wright, Jason T.; Driscoll, Peter; Butler, R. Paul; Hekker, Saskia; Reffert, Sabine; Vogt, Steven S. (2007). "Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants". The Astrophysical Journal. 665 (1): 785–793. arXiv:0704.2455. Bibcode:2007ApJ...665..785J. doi:10.1086/519677. ISSN 0004-637X.
  5. "Andorra". NameExoworlds. Retrieved 2019-12-18.
  6. HD 131496 b on exoplanet.eu
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