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A hot Uranus transiting the nearby M dwarf GJ 3470 : detected with HARPS velocimetry. Captured in transit with TRAPPIST photometry

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Bonfils, X., Gillon, M., Udry, S., Armstrong, David J., Bouchy, F., Delfosse, X., Forveille, T., Fumel, A., Jehin, E., Lendl, M., Lovis, C., Mayor, M., McCormac, J. J., Neves, V., Pepe, F., Perrier, C., Pollaco, D., Queloz, D. and Santos, N. C. (2012) A hot Uranus transiting the nearby M dwarf GJ 3470 : detected with HARPS velocimetry. Captured in transit with TRAPPIST photometry. Astronomy & Astrophysics, Volume 546 . Article number A27. doi:10.1051/0004-6361/201219623 ISSN 0004-6361.

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Official URL: http://dx.doi.org/10.1051/0004-6361/201219623

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Abstract

We report on the discovery of GJ 3470 b, a transiting hot Uranus of mass mp = 14.0 ± 1.8 M⊕, radius Rp = 4.2 ± 0.6 R⊕ and period P = 3.3371 ± 0.0002 day. Its host star is a nearby (d = 25.2 ± 2.9 pc) M1.5 dwarf of mass M⋆ = 0.54 ± 0.07 M⊙ and radius R⋆ = 0.50 ± 0.06 R⊙. The detection was made during a radial-velocity campaign with Harps that focused on the search for short-period planets orbiting M dwarfs. Once the planet was discovered and the transit-search window narrowed to about 10% of an orbital period, a photometric search started with Trappist and quickly detected the ingress of the planet. Additional observations with Trappist, EulerCam and Nites definitely confirmed the transiting nature of GJ 3470b and allowed the determination of its true mass and radius. The star’s visible or infrared brightness (Vmag = 12.3, Kmag = 8.0), together with a large eclipse depth D = 0.57 ± 0.05%, ranks GJ 3470 b among the most suitable planets for follow-up characterizations.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): M stars -- Motion in line of sight, Astronomical photometry, Planetary systems, Dwarf stars
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: 2012
Dates:
DateEvent
2012UNSPECIFIED
Volume: Volume 546
Article Number: Article number A27
DOI: 10.1051/0004-6361/201219623
Status: Peer Reviewed
Publication Status: Published
Date of first compliant deposit: 18 April 2016
Date of first compliant Open Access: 18 April 2016
Funder: Fonds national de la recherche scientifique (Belgium) (FNRS), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), Seventh Framework Programme (European Commission) (FP7), Fundação para a Ciência e a Tecnologia (FCT) (Portugal)
Grant number: FRFC 2.5.594.09.F (FNRS), 239953 (FP7), PTDC/CTE-AST/098528/2008 (FCT), PTDC/CTE-AST/098604/2008 (FCT), SFRH/BD/60688/2009 (FCT)

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