HD 20781 e
Discovery[1]
Discovered byMayor et al.
Discovery date2011, published in 2019[2]
Radial velocity[3]
Orbital characteristics[4]
0.3374+0.0155
−0.0170 AU
Eccentricity0.06+0.06
−0.04
85.5073+0.0983
−0.0947 d
2,455,513.3912+14.3623
−16.0090 JD
70.59°+61.40°
−67.58°
Semi-amplitude2.60±0.14 m/s
StarHD 20781
Physical characteristics
Mean radius
~2.17 R🜨 (estimate)[2]
Mass≥14.03±1.56 M🜨[4]

    HD 20781 e is a hot Neptune around the star HD 20781. The planet has a minimum mass of 14.03 Earth masses[4] and it orbits with a semi-major axis of 0.3374 astronomical units and an orbital eccentricity of approximately 0.06.[2][4] With the same composition as Neptune, it would have a radius of 3.79 times that of the Earth. With the same composition as Earth, it would have a radius of 2.08 times that of the Earth. It orbits near the inner edge of the habitable zone of HD 20781.

    This planet was initially reported in a 2011 preprint, which referred to it as HD 20781 c.[1] However, the 2017 paper (published in a journal in 2019) that confirmed the planet designated it HD 20781 e, using the c designation for a different, shorter-period planet.[4]

    References

    1. 1 2 Mayor, M.; Marmier, M.; Lovis, C.; Udry, S.; Ségransan, D.; Pepe, F.; Benz, W.; Bertaux, J.-L.; Bouchy, F.; Dumusque, X.; Curto, G. Lo; Mordasini, C.; Queloz, D.; Santos, N. C. (2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497 [astro-ph.EP].
    2. 1 2 3 "Exoplanet Catalog HD 20781". NASA. Retrieved 4 April 2021.
    3. ↑ "Planet HD 20781 e". Extrasolar Planets Encyclopaedia. Retrieved 2 January 2016.
    4. 1 2 3 4 5 Udry, S.; Dumusque, X.; Lovis, C.; Ségransan, D.; Diaz, R. F.; Benz, W.; Bouchy, F.; Coffinet, A.; Lo Curto, G.; Mayor, M.; Mordasini, C.; Motalebi, F.; Pepe, F.; Queloz, D.; Santos, N. C.; Wyttenbach, A.; Alonso, R.; Collier Cameron, A.; Deleuil, M.; Figueira, P.; Gillon, M.; Moutou, C.; Pollacco, D.; Pompei, E. (February 2019). "The HARPS search for southern extra-solar planets: XLIV. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions". Astronomy & Astrophysics. 622: A37. arXiv:1705.05153. Bibcode:2019A&A...622A..37U. doi:10.1051/0004-6361/201731173. ISSN 0004-6361.

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