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TESS Spots a Hot Jupiter with an Inner Transiting Neptune

Huang, CX; Quinn, SN; Vanderburg, A; Becker, J; Rodriguez, JE; Pozuelos, FJ; Gandolfi, D; ... Wong, I; + view all (2020) TESS Spots a Hot Jupiter with an Inner Transiting Neptune. Astrophysical Journal Letters , 892 (1) , Article L7. 10.3847/2041-8213/ab7302. Green open access

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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 RÅ) with a 4.1 days period, and a hot Jupiter ( - + 1.50 0.22 0.27 RJ) 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 MJ. For the inner Neptune, the data provide only an upper limit on the mass of 0.17 MJ (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

Type: Article
Title: TESS Spots a Hot Jupiter with an Inner Transiting Neptune
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/2041-8213/ab7302
Publisher version: https://doi.org/10.3847/2041-8213/ab7302
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10103474
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