1. TESS Spots a Hot Jupiter with an Inner Transiting Neptune
- Author
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Chelsea X Huang, Samuel N Quinn, Andrew Vanderburg, Juliette Becker, Joseph E Rodriguez, Francisco J Pozuelos, Davide Gandolfi, George Zhou, Andrew W Mann, Karen A Collins, Ian Crossfield, Khalid Barkaoui, Kevin I Collins, Malcolm Fridlund, Michaël Gillon, Erica J Gonzales, Maximilian N Günther, Todd J Henry, Steve B Howell, Hodari-Sadiki James, Wei-Chun Jao, Emmanuël Jehin, Eric L N Jensen, Stephen R Kane, Jack J Lissauer, Elisabeth Matthews, Rachel A Matson, Leonardo A Paredes, Joshua E Schlieder, Keivan G Stassun, Avi Shporer, Lizhou Sha, Thiam-Guan Tan, Iskra Georgieva, Savita Mathur, Enric Pallé, Carina M Persson, Vincent Van Eylen, George R Ricker, Roland K Vanderspek, David W Latham, Joshua N Winn, S Seager, Jon M Jenkins, Christopher J Burke, Robert F Goeke, Stephen Rinehart, Mark E Rose, Eric B Ting, Guillermo Torres, and Ian Wong
- Subjects
Astronomy - Abstract
Hot Jupiters are rarely accompanied by other planets within a factor of a few in orbital distance. Previously, only two such systems have been found. Here, we report the discovery of a third system using data from the Transiting Exoplanet Survey Satellite (TESS). The host star, TOI-1130, is an eleventh magnitude K-dwarf in Gaia G-band. It has two transiting planets: a Neptune-sized planet (3.65±0.10 Rꚛ) with a 4.1 days period, and a hot Jupiter (-1.50(+0.22,-0.27) R(J)) with an 8.4 days period. Precise radial-velocity observations show that the mass of the hot Jupiter is -0.974(+0.044, 0.043) M(J). For the inner Neptune, the data provide only an upper limit on the mass of 0.17M(J)(3σ). Nevertheless, we are confident that the inner planet is real, based on follow-up ground-based photometry and adaptive-optics imaging that rule out other plausible sources of the TESS transit signal. The unusual planetary architecture of and the brightness of the host star make TOI-1130 a good test case for planet formation theories, and an attractive target for future spectroscopic observations.
- Published
- 2020
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