Astronomy:HD 15082

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Short description: Star in the constellation Andromeda
HD 15082
V807AndLightCurve.png
A light curve for V807 Andromedae (HD 15082), plotted from TESS data.[1] The deep minima are caused by the planet transits.
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda
Right ascension  02h 26m 51.0583s[2]
Declination +37° 33′ 01.7377″[2]
Apparent magnitude (V) 8.3[3]
Characteristics
Spectral type A5[4]
B−V color index 0.27[5]
Variable type δ Sct[3]+Planetary transit variable
Astrometry
Radial velocity (Rv)−9.20±2.8[6] km/s
Proper motion (μ) RA: −0.976±0.118[2] mas/yr
Dec.: −8.977±0.105[2] mas/yr
Parallax (π)8.1724 ± 0.0661[2] mas
Distance399 ± 3 ly
(122.4 ± 1.0 pc)
Details
Mass1.55 ± 0.04[7] M☉
Radius1.51[8] R☉
Surface gravity (log g)4.3 ± 0.2[3] cgs
Temperature7,400 ± 200[3] K
Metallicity [Fe/H]0.1 ± 0.2[7] dex
Rotational velocity (v sin i)86[3] km/s
Age100[9] Myr
Other designations
V807 And, BD+36 489, HD 15082, HIP 11397, SAO 55561, WASP-33, 2MASS J02265106+3733017, Gaia DR2 328636019723252096
Database references
SIMBADdata

HD 15082 (also known as WASP-33) is a star located roughly 399 light years away[2] in the northern constellation of Andromeda.[10] The star is a Delta Scuti variable[11] and a planetary transit variable. A hot Jupiter type extrasolar planet, named WASP-33b or HD 15082b, orbits this star with an orbital period of 1.22 days. It is the first Delta Scuti variable known to host a planet.[12]

Spectrum

HD 15082 is an Am star, which makes its stellar classification challenging to discern. The hydrogen lines and effective temperature of the star are similar to spectral type A8, however the calcium II K line resembles that of an A5 star, and the metallic lines are more similar to an F4 star. The spectral type is written kA5hA8mF4.[7]

Pulsations

Delta Scuti variables usually exhibit many pulsation modes, and HD 15082 is no exception, with 8 measured high frequency p-modes.[11] Another proposed non-radial mode, which could be induced by tidal interactions with the planet, would make this star also a Gamma Doradus variable.[7] This star has the GCVS variable star designation V807 Andromedae. [13]

Planetary system

In 2010, the SuperWASP project announced the discovery of an extrasolar planet, designated WASP-33b, orbiting the star. The discovery was made by detecting the transit of the planet as it passes in front of its star, an event which occurs every 1.22 days.

The HD 15082 planetary system[7][14][note 1]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b < 4.59 MJ 0.02558 (± 0.00023) 1.21987089 ± 1.5×10−07 0 87.67° 1.438 RJ

Notes

  1. ↑ Parameters from the photometric + radial velocity solution in table 3 of Cameron et al. (2010). Different analysis methods result in slightly different parameters, see Cameron et al. (2010) for details.

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Herrero, E. et al. (February 2011). "WASP-33: the first δ Scuti exoplanet host star". Astronomy and Astrophysics 526: L10. doi:10.1051/0004-6361/201015875. Bibcode: 2011A&A...526L..10H. 
  4. ↑ exoplanet.eu. "Planet WASP-33 b." The Extrasolar Planet Encyclopaedia - WASP-33 b, https://exoplanet.eu/catalog/wasp_33_b--671/
  5. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy & Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H. 
  6. ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Collier Cameron, A. et al. (2010). "Line-profile tomography of exoplanet transits - II. A gas-giant planet transiting a rapidly rotating A5 star". Monthly Notices of the Royal Astronomical Society 407 (1): 507. doi:10.1111/j.1365-2966.2010.16922.x. Bibcode: 2010MNRAS.407..507C. 
  8. ↑ Goyal, Jayesh M.; Mayne, Nathan; Sing, David K.; Drummond, Benjamin; Tremblin, Pascal; Amundsen, David S.; Evans, Thomas; Carter, Aarynn L. et al. (2018). "A library of ATMO forward model transmission spectra for hot Jupiter exoplanets". Monthly Notices of the Royal Astronomical Society 474 (4): 5158. doi:10.1093/mnras/stx3015. Bibcode: 2018MNRAS.474.5158G. 
  9. ↑ Moya, A. et al. (November 2011). "High spatial resolution imaging of the star with a transiting planet WASP-33". Astronomy & Astrophysics 535: A110. doi:10.1051/0004-6361/201116889. Bibcode: 2011A&A...535A.110M. 
  10. ↑ "WASP-33 b". ETD - Exoplanet Transit Database. http://var2.astro.cz/ETD/etd.php?STARNAME=WASP-33&PLANET=b. 
  11. ↑ 11.0 11.1 von Essen, C.; Czesla, S.; Wolter, U.; Breger, M.; Herrero, E.; Mallonn, M.; Ribas, I.; Strassmeier, K. G. et al. (2014). "Pulsation analysis and its impact on primary transit modeling in WASP-33". Astronomy and Astrophysics 561: A48. doi:10.1051/0004-6361/201322453. Bibcode: 2014A&A...561A..48V. 
  12. ↑ "Discovery Of A Pulsating Star That Hosts A Giant Planet". Science Daily. January 19, 2011. http://www.spacedaily.com/reports/Discovery_Of_A_Pulsating_Star_That_Hosts_A_Giant_Planet_999.html. 
  13. ↑ "GCVS Query forms". http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=V807+And. 
  14. ↑ Zhang, Michael et al. (2017). "Phase curves of WASP-33b and HD 149026b and a New Correlation Between Phase Curve Offset and Irradiation Temperature". The Astronomical Journal 155 (2): 83. doi:10.3847/1538-3881/aaa458. Bibcode: 2018AJ....155...83Z. 

Coordinates: Sky map 02h 26m 51.0583s, +37° 33′ 01.7377″



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