HAT-P-41

HAT-P-41 is a binary star system. Its primary is a F-type main-sequence star. Its surface temperature is 6390±100 K.[4] compared to the Sun, HAT-P-41 is enriched in heavy elements, with a metallicity Fe/H index of 0.21±0.10, but is much younger at an age of 2.2±0.4 billion years.[4]

HAT-P-41
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 49m 17.4400s[1]
Declination 04° 40′ 20.7836″[1]
Apparent magnitude (V) 11.36
Characteristics
HAT-P-41
Evolutionary stage main-sequence star
Spectral type F9V[2]
HAT-P-41B
Spectral type K9-M0[2]
Astrometry
Radial velocity (Rv)33.2±0.5[3] km/s
Proper motion (μ) RA: −3.177[3] mas/yr
Dec.: −6.570[3] mas/yr
Parallax (π)2.8477 ± 0.0176 mas[3]
Distance1,145 ± 7 ly
(351 ± 2 pc)
Position (relative to HAT-P-41)[2]
ComponentHAT-P-41B
Epoch of observation2013
Angular distance3.619±0.005″
Position angle184.1±0.2°
Observed separation
(projected)		1270 AU
Details[4]
Mass1.418±0.047 M☉
Radius1.683+0.058
−0.036 R☉
Temperature6390±100 K
Metallicity [Fe/H]0.21±0.10 dex
Rotational velocity (v sin i)19.60±0.50 km/s
Age2.2±0.4 Gyr
Other designations
TYC 488-2442-1, GSC 00488-02442, 2MASS J19491743+0440207[1]
HAT-P-41: Gaia DR2 4290415081653653632, Gaia EDR3 4290415081653653632
HAT-P-41B: Gaia DR2 4290415081653653376, Gaia EDR3 4290415081653653376
Database references
SIMBADdata
Hat-P-41b

The candidate stellar companion was detected simultaneously with the planet discovery in 2012.[5] A multiplicity survey in 2015 did confirm a dim stellar companion of later-K to early-M spectral class, with the probability of being a background star of 14%.[2] By 2020, it was concluded the candidate companion star is probably gravitationally bound.[6]

Planetary system

In 2012, one planet, named HAT-P-41b, was discovered on a tight, circular orbit around the primary star.[5]

The planetary orbit is mildly misaligned with the equatorial plane of the star, misalignment angle equal to −22.1+0.8
−6.0 degrees.[7]

The transmission spectrum of HAT-P-41b taken in 2020 has resulted in contradictory interpretations. One team has concluded the planetary atmosphere is metal-rich, with clear water signatures and absorption bands from sodium, aluminum, titanium and vanadium compounds.[8] Another team has interpreted the results as arising from a dense hydrogen atmosphere without detectable heavy elements, but with significant ionization.[9] The atmosphere also appears to contain significant cloud and hazes.[10] Neither heavy element compounds nor H− ion opacity were found in 2022 study.[11]

The planetary equilibrium temperature is within 1700-1950 K,[9] and the dayside temperature has been measured at 1622±125 K.[12]

The HAT-P-41 planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.795+0.056
−0.091 MJ		 0.04258+0.00047
−0.00048		 2.694047±0.000004 <0.22 87.7±1.0° 1.685+0.076
−0.051 RJ

References
  1. "HAT-P-41". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-21.
  2. Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics, 575: A23, arXiv:1507.01938, Bibcode:2015A&A...575A..23W, doi:10.1051/0004-6361/201424091, S2CID 119250579
  3. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A.; Lodato, G.; Marzari, F.; Boccato, C.; Claudi, R. U.; Cosentino, R.; Covino, E.; Gratton, R.; Maggio, A.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Affer, L.; Biazzo, K.; Bignamini, A.; Esposito, M.; Giacobbe, P.; Hébrard, G.; Malavolta, L.; et al. (2017), "The GAPS Programme with HARPS-N at TNG", Astronomy & Astrophysics, 602: A107, arXiv:1704.00373, Bibcode:2017A&A...602A.107B, doi:10.1051/0004-6361/201629882, S2CID 118923163
  5. Hartman, J. D.; et al. (2012), "HAT-P-39b–HAT-P-41b: Three Highly Inflated Transiting Hot Jupiters", The Astronomical Journal, 144 (5): 139, arXiv:1207.3344, Bibcode:2012AJ....144..139H, doi:10.1088/0004-6256/144/5/139, S2CID 118457589
  6. Bohn, A. J.; Southworth, J.; Ginski, C.; Kenworthy, M. A.; Maxted, P. F. L.; Evans, D. F. (2020), "A multiplicity study of transiting exoplanet host stars", Astronomy & Astrophysics, 635: A73, arXiv:2001.08224, Bibcode:2020A&A...635A..73B, doi:10.1051/0004-6361/201937127, S2CID 210861118
  7. Johnson, Marshall C.; Cochran, William D.; Addison, Brett C.; Tinney, Chris G.; Wright, Duncan J. (2017), "Spin–Orbit Misalignments of Three Jovian Planets via Doppler Tomography", The Astronomical Journal, 154 (4): 137, arXiv:1708.01291, Bibcode:2017AJ....154..137J, doi:10.3847/1538-3881/aa8462, S2CID 119487498
  8. Sheppard, Kyle B.; et al. (2021). "The Hubble PanCET Program: A Metal-rich Atmosphere for the Inflated Hot Jupiter HAT-P-41b". The Astronomical Journal. 161 (2): 51. arXiv:2010.09659. Bibcode:2021AJ....161...51S. doi:10.3847/1538-3881/abc8f4. S2CID 224710738.
  9. Lewis, N. K.; et al. (2020), "Into the UV: The Atmosphere of the Hot Jupiter HAT-P-41b Revealed", The Astrophysical Journal, 902 (1): L19, arXiv:2010.08551, Bibcode:2020ApJ...902L..19L, doi:10.3847/2041-8213/abb77f, S2CID 224706001
  10. Wakeford, H. R.; Sing, D. K.; Stevenson, K. B.; Lewis, N. K.; Pirzkal, N.; Wilson, T. J.; Goyal, J.; Kataria, T.; Mikal-Evans, T.; Nikolov, N.; Spake, J. (2020), "Into the UV: A Precise Transmission Spectrum of HAT-P-41b Using Hubble's WFC3/UVIS G280 Grism", The Astronomical Journal, 159 (5): 204, arXiv:2003.00536, Bibcode:2020AJ....159..204W, doi:10.3847/1538-3881/ab7b78, S2CID 211677682
  11. Fu, Guangwei; Sing, David K.; Deming, Drake; Sheppard, Kyle; Wakeford, H. R.; Mikal-Evans, Thomas; Alam, Munazza K.; Dos Santos, Leonardo A.; López-Morales, Mercedes; Lothringer, Joshua D. (2022), "The Hubble PanCET Program: Emission Spectrum of Hot Jupiter HAT-P-41b", The Astronomical Journal, 163 (4): 190, arXiv:2202.12314, Bibcode:2022AJ....163..190F, doi:10.3847/1538-3881/ac58fc, S2CID 247154998
  12. Garhart, Emily; Deming, Drake; Mandell, Avi; Knutson, Heather A.; Wallack, Nicole; Burrows, Adam; Fortney, Jonathan J.; Hood, Callie; Seay, Christopher; Sing, David K.; Benneke, Björn; Fraine, Jonathan D.; Kataria, Tiffany; Lewis, Nikole; Madhusudhan, Nikku; McCullough, Peter; Stevenson, Kevin B.; Wakeford, Hannah (2020), "Statistical Characterization of Hot Jupiter Atmospheres Using Spitzer's Secondary Eclipses", The Astronomical Journal, 159 (4): 137, arXiv:1901.07040, Bibcode:2020AJ....159..137G, doi:10.3847/1538-3881/ab6cff, S2CID 119209434
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