Astronomy:HD 63935

From HandWiki
Short description: High proper-motion star in the constellation Canis Minor


HD 63935
File:Canis Minor constellation map.svg
Observation data
Equinox J2000.0]] (ICRS)
Constellation Canis Minor[1]
Right ascension  07h 51m 41.996s[2]
Declination +09° 23′ 9.79″[2]
Apparent magnitude (V) 8.58[1]
Characteristics
Evolutionary stage main sequence[2]
Spectral type G5[3]
Apparent magnitude (G) 8.40[2]
Astrometry
Radial velocity (Rv)−20.33±0.12[2] km/s
Proper motion (μ) RA: −78.696±0.022[2] mas/yr
Dec.: −188.512±0.013[2] mas/yr
Parallax (π)20.47 ± 0.019[2] mas
Distance159.3 ± 0.1 ly
(48.85 ± 0.05 pc)
Absolute magnitude (MV)+5.15[1]
Details
Mass0.9406+0.0342
−0.0318[4] M☉
Radius0.9598+0.0168
−0.0167[4] R☉
Luminosity0.76[5] L☉
Surface gravity (log g)4.46[5] cgs
Temperature5,513+71
−73[4] K
Rotational velocity (v sin i)1.8[6] km/s
Age6.6+2.5
−2.4[4] Myr
Other designations
BD+09°1791, HD 63935, HIP 38374, SAO 116039, PPM 153456, LSPM J0751+0923, LTT 12075, TYC 783-536-1[7]
Database references
SIMBADdata

HD 63935 is a G-type main-sequence star located in the constellation of Canis Minor. It is approximately 160 light-years (49 parsecs) from the Solar System and has an apparent visual magnitude of 8.58, making it faintly visible to the naked eye under optimal conditions. The star hosts two confirmed sub-Neptune-sized planets. These planets were discovered by the Transiting Exoplanet Survey Satellite (TESS) and confirmed with precision radial-velocity observations as part of the TESS–Keck Survey.[8] Exoplanet atmospheric studies also took place on this system.[9][10]

Discovery and observation

The HD 63935 system was given the designation TOI-509 (TESS Object of Interest) during Sector 4 observations in 2018–2019.[11] Transit signals for both planets were detected in the full-frame images and confirmed via ground-based photometry. Radial velocity follow-up by the TESS-Keck Survey, led by researchers including Scarsdale et al. (2021)[8], provided mass constraints, revealing the planets' sub-Neptune nature.

Subsequent analyses, such as those by MacDougall et al. (2023)[12] and Polanski et al. (2024)[13], refined orbital parameters and stellar properties using data from Gaia DR3 and other surveys.

Planetary system

The HD 63935 system features two transiting sub-Neptune exoplanets in short-period orbits, often referred to as "twin" planets due to their comparable sizes, masses, and densities. Both planets were identified as candidates by TESS and confirmed through high-precision radial velocity measurements using the HIRES spectrograph on the Keck Observatory.[8] The inner planet, HD 63935 b (also known as TOI-509.01), orbits every 9.06 days, while the outer planet, HD 63935 c, has an orbital period of 21.40 days. Their near-circular orbits (eccentricity e ≈ 0) and low masses (around 10–11 Earth masses) suggest they are gas-enveloped worlds with rocky cores, typical of sub-Neptunes.[4]

During the identification of the two exoplanets the possibility of a third exoplanet was noted and it was suggested further observations would rule it out.[8]

The HD 63935 planetary system[4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 10.8±1.8 MJ 0.083±0.002 9.058807±0.000015 — 88.4900±0.0018° 2.99±0.14 RJ
c 11.1±2.4 MJ 0.148±0.003 21.4027±0.0018 — 88.2410+0.0011
−0.0013° 		2.90±0.13 RJ

See also

References

  1. ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ Cannon, A. J.; Pickering, E. C. (1993). "VizieR Online Data Catalog: Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)". Vizier Online Data Catalog. Bibcode: 1993yCat.3135....0C. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 "HD 63935 | NASA Exoplanet Archive". https://exoplanetarchive.ipac.caltech.edu/overview/HD%2063935. 
  5. ↑ 5.0 5.1 De Laverny, Patrick; Ligi, Roxanne; Crida, Aurélien; Recio-Blanco, Alejandra; Palicio, Pedro A. (2025). "The Gaia spectroscopic catalogue of exoplanets and host stars". Astronomy and Astrophysics 699: A100. doi:10.1051/0004-6361/202554739. Bibcode: 2025A&A...699A.100D. 
  6. ↑ Tsantaki, M.; Magrini, L.; Danielski, C.; Bossini, D.; Turrini, D.; Moedas, N.; Folsom, C. P.; Ramler, H. et al. (2025). "Ariel stellar characterisation: III. Fast rotators and new FGK stars in the Ariel mission candidate sample". Astronomy and Astrophysics 697. doi:10.1051/0004-6361/202453059. Bibcode: 2025A&A...697A.102T. 
  7. ↑ "HD 63935". https://simbad.cds.unistra.fr/simbad/sim-id?Ident=HD+63935&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id. 
  8. ↑ 8.0 8.1 8.2 8.3 Scarsdale, Nicholas (2021). "TESS-Keck Survey. V. Twin Sub-Neptunes Transiting the Nearby G Star HD 63935". The Astronomical Journal 162 (5): 215. doi:10.3847/1538-3881/ac18cb. Bibcode: 2021AJ....162..215S. 
  9. ↑ Scarsdale, N.; Murphy, J.; Batalha, N.; Team, TESS-Keck Survey (March 2021). "A High Quality Atmospheric Target in a Sparse Region of Mass-Radius Space around HD 63935" (in en). Bulletin of the American Astronomical Society 53 (3): 1208. Bibcode: 2021BAAS...53c1208S. 
  10. ↑ Scarsdale, N.; Murphy, J. M.; Batalha, N. (2021-01-25). "HD 63935's Space Oddities: Two Atmospheric Targets in Sparse Regions of Mass-Radius Space" (in en). Bulletin of the AAS 53 (1). https://baas.aas.org/pub/2021n1i117p07/release/1. 
  11. ↑ Soubiran, C.; Jasniewicz, G.; Chemin, L.; Zurbach, C.; Brouillet, N.; Panuzzo, P.; Sartoretti, P.; Katz, D. et al. (2018-08-01). "Gaia Data Release 2 - The catalogue of radial velocity standard stars" (in en). Astronomy & Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. ISSN 0004-6361. 
  12. ↑ Polanski, Alex S.; Lubin, Jack; Beard, Corey; Akana Murphy, Joseph M.; Rubenzahl, Ryan; Hill, Michelle L.; Crossfield, Ian J. M.; Chontos, Ashley et al. (2024-06-01). "The TESS-Keck Survey. XX. 15 New TESS Planets and a Uniform RV Analysis of All Survey Targets". The Astrophysical Journal Supplement Series 272 (2): 32. doi:10.3847/1538-4365/ad4484. ISSN 0067-0049. 
  13. ↑ MacDougall, Mason G.; Petigura, Erik A.; Gilbert, Gregory J.; Angelo, Isabel; Batalha, Natalie M.; Beard, Corey; Behmard, Aida; Blunt, Sarah et al. (2023-07-01). "The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars". The Astronomical Journal 166 (1): 33. doi:10.3847/1538-3881/acd557. ISSN 0004-6256. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:HD_63935&oldid=4389512"