HD 179949 b

HD 179949 b is an extrasolar planet discovered by the Anglo-Australian Planet Search at the Anglo-Australian Observatory, which orbits the star HD 179949. The planet is a so-called "hot Jupiter", a Jupiter-mass planet orbiting very close to its parent star. In this case, orbital distance is almost one-tenth that of Mercury from the Sun. One orbital revolution lasts only about 3 days.[3][4]

HD 179949 b
Discovery
Discovered byTinney et al.
Discovery siteAnglo-Australian
Observatory
Discovery dateDec 3, 2000[1]
Radial velocity
Orbital characteristics
0.0443 ± 0.0026 AU (6,630,000 ± 390,000 km)
Eccentricity0.022±0.015
3.092514±0.000032 d
Inclination67.7±4.3
2,451,002.32±0.44
192
Semi-amplitude112.6±1.8
StarHD 179949
Physical characteristics
Mass0.98±0.077[2] MJ

    Its magnetic field induces a bright spot on its star at 30 degrees latitude, which rotates at 87 degrees inclination. If the planet orbited at 83-97 degrees, then its transit would be visible from Earth. The angle of inclination is therefore 83 degrees or less, but not much less; and its mass is constrained to not much more than 0.923±0.077. The star is not tidally locked to the planet.[5]

    Assuming the planet is perfectly grey with no greenhouse or tidal effects, and a Bond albedo of 0.1, the temperature would be 1533 K. This is, like Tau Boötis b, hotter than the predicted temperature of HD 209458 b (1392K), and close to that of HD 149026 b, before they were measured.

    Searches for water in the planet's atmosphere have been inconclusive at first, as have attempts to determine whether titanium and vanadium oxides are present.[6] In the meantime, both carbon monoxide and water have been found in the dayside emission of HD 179949b.[7]

    HD 179949 b is a candidate for "near-infrared characterisation.... with the VLTI Spectro-Imager".[8]

    The light reflected off planet could not be detected as in 2021, implying HD 179949 b has a low albedo.[9]

    The planet HD 179949 b is named Mastika. The name was selected in the NameExoWorlds campaign by Brunei,[10] during the 100th anniversary of the IAU. Mastika is a Malay word, which means a gem, precious stone, jewel or the prettiest, the most beautiful.[11][12]

    The inner Solar System superimposed behind the orbits of the planets HD 179949 b, HD 164427 b, Epsilon Reticuli Ab, and Mu Arae b (each planet has its parent star labeled next to it -- all parent stars are in the center)

    References
    1. Tinney, Chris (2007-09-07). "AAPS Discovered Planets". Anglo-Australian Planet Search. University of New South Wales. Retrieved 2018-04-17.
    2. Brogi, M.; De Kok, R. J.; Birkby, J. L.; Schwarz, H.; Snellen, I. A. G. (2014). "Carbon monoxide and water vapor in the atmosphere of the non-transiting exoplanet HD 179949 B". Astronomy & Astrophysics. 565: A124. arXiv:1404.3769v1. Bibcode:2014A&A...565A.124B. doi:10.1051/0004-6361/201423537.
    3. Tinney, C. G.; et al. (2001). "First Results from the Anglo-Australian Planet Search: A Brown Dwarf Candidate and a 51 Peglike Planet". The Astrophysical Journal. 551 (1): 507–511. arXiv:astro-ph/0012204. Bibcode:2001ApJ...551..507T. doi:10.1086/320097.
    4. Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.
    5. Shkolnik and Walker; Walker, G. A. H.; Bohlender, D. A. (2003). "Evidence for Planet-induced Chromospheric Activity on HD 179949". The Astrophysical Journal. 597 (2): 1092–1096. arXiv:astro-ph/0303557. Bibcode:2003ApJ...597.1092S. doi:10.1086/378583.
    6. J. R. Barnes; Barman; Jones; Leigh; Cameron; Barber; Pinfield; et al. (3 Oct 2008). "HD 179949b: a close orbiting extrasolar giant planet with a stratosphere?". Monthly Notices of the Royal Astronomical Society. 390 (3): 1258. arXiv:0806.0298. Bibcode:2008MNRAS.390.1258B. doi:10.1111/j.1365-2966.2008.13831.x.
    7. Brogi, M.; Kok, R. J. de; Birkby, J. L.; Schwarz, H.; Snellen, I. A. G. (2014). "Carbon monoxide and water vapor in the atmosphere of the non-transiting exoplanet HD 179949 b". Astronomy & Astrophysics. 565: A124. arXiv:1404.3769. Bibcode:2014A&A...565A.124B. doi:10.1051/0004-6361/201423537. ISSN 0004-6361.
    8. Renard, S.; Absil, O.; Berger, J.-P.; Bonfils, X.; Forveille, T.; Malbet, F. (2008). "Prospects for near-infrared characterisation of hot Jupiters with the VLTI Spectro-Imager (VSI)". Optical and Infrared Interferometry. Optical and Infrared Interferometry. Edited by Schöller. Optical and Infrared Interferometry. 7013. pp. 70132Z. arXiv:0807.3014. Bibcode:2008SPIE.7013E..2ZR. doi:10.1117/12.790494.
    9. Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization, 2021, arXiv:2101.07411
    10. "NameExoWorlds Brunei – Bruneiastronomy.org". Retrieved 2020-10-11.
    11. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
    12. "Approved names". NameExoworlds. Retrieved 2020-01-02.

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