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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
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Official URL: http://dx.doi.org/10.1051/0004-6361/201219623
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 > 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: |
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| Date of first compliant deposit: | 18 April 2016 | ||||
| Volume: | Volume 546 | ||||
| Article Number: | Article number A27 | ||||
| DOI: | 10.1051/0004-6361/201219623 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| 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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