WASP-32

WASP-32 (also known as TYC 2-1155-1) is a yellow main-sequence star in the constellation of Pisces. The star was given the formal name Parumleo in January 2020, Latin for small lion and referencing the national animal of Singapore.[5]

WASP-32 / Parumleo
Observation data
Epoch J2000      Equinox
Constellation Pisces
Right ascension 00h 15m 50.80778s[1]
Declination 01° 12′ 01.5868″[1]
Apparent magnitude (V) 11.26[2]
Characteristics
Evolutionary stage main sequence star
Spectral type G0V
B−V color index -0.2
J−H color index 0.005
J−K color index 0.342
Astrometry
Radial velocity (Rv)18.41±0.83[3] km/s
Proper motion (μ) RA: 1.896±0.09[1] mas/yr
Dec.: 16.589±0.062[1] mas/yr
Parallax (π)3.5949 ± 0.0431 mas[1]
Distance910 ± 10 ly
(278 ± 3 pc)
Details
Mass1.10±0.03[4] M☉
Radius1.11±0.05[4] R☉
Luminosity1.5 L☉
Surface gravity (log g)4.39±0.03[4] cgs
Temperature6100±100[4] K
Metallicity [Fe/H]−0.13±0.10[4] dex
Rotational velocity (v sin i)4.8±0.8[4] km/s
Other designations
Parumleo, Gaia DR2 2546413408888429696, TYC 2-1155-1, 2MASS J00155080+0112016[1]
Database references
SIMBADdata

Star characteristics

The WASP-32 star is relatively depleted of lithium, which is common for massive stars hosting hot Jupiter planets.[4]

Planetary system

The "hot Jupiter" class planet WASP-32 b, later named Viculus, was discovered around WASP-32 in 2010.[4] It was found to orbit the parent star in prograde direction in 2014.[6]

The follow-up study utilizing transit timing variation analysis, have failed to find any, therefore have excluded existence of other massive planets around WASP-32 as in 2015.[7]

The WASP-32 planetary system[8]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (Viculus) 3.6±0.07 MJ 0.0394±0.0003 2.71865±0.00008 0.018±0.0065 85.3±0.5° 1.18±0.07 RJ

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.
  2. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. "WASP-32". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-05-09.
  4. Maxted, P. F. L.; Anderson, D. R.; Collier Cameron, A.; Gillon, M.; Hellier, C.; Queloz, D.; Smalley, B.; Triaud, A. H. M. J.; West, R. G.; Enoch, R.; Lister, T. A.; Pepe, F.; Pollacco, D. L.; Ségransan, D.; Skillen, I.; Udry, S. (2010). "WASP-32b: A Transiting Hot Jupiter Planet Orbiting a Lithium-Poor, Solar-Type Star". Publications of the Astronomical Society of the Pacific. 122 (898): 1465–1470. arXiv:1010.1742. Bibcode:2010PASP..122.1465M. doi:10.1086/657658. S2CID 55625415.
  5. A star and its orbiting planet now bear names with Singapore connection
  6. Brothwell, R. D.; Watson, C. A.; Hébrard, G.; Triaud, A. H. M. J.; Cegla, H. M.; Santerne, A.; Hébrard, E.; Anderson, D. R.; Pollacco, D.; Simpson, E. K.; Bouchy, F.; Brown, D. J. A.; Chew, Y. Gómez Maqueo; Cameron, A. Collier; Armstrong, D. J.; Barros, S. C. C.; Bento, J.; Bochinski, J.; Burwitz, V.; Busuttil, R.; Delrez, L.; Doyle, A. P.; Faedi, F.; Fumel, A.; Gillon, M.; Haswell, C. A.; Hellier, C.; Jehin, E.; Kolb, U.; et al. (2014). "A window on exoplanet dynamical histories: Rossiter–Mc Laughlin observations of WASP-13b and WASP-32b". Monthly Notices of the Royal Astronomical Society. 440 (4): 3392–3401. arXiv:1403.4095. Bibcode:2014MNRAS.440.3392B. doi:10.1093/mnras/stu520. S2CID 118435056.
  7. Lei-Lei Sun, Sheng-Hong Gu, Xiao-Bin Wang at al., "Long-term transit timing monitoring and homogenous study of WASP-32", 2015
  8. Planet WASP-32 b
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