HD 1397b: A Transiting Warm Giant Planet Orbiting A V = 7.8 mag Subgiant Star 
Discovered by TESS

Brahm, Rafael; Espinoza, Néstor; Jordán, Andrés; Henning, Thomas; Sarkis, Paula; Jones, Matías I.; Díaz, Matías R.; Jenkins, James S.; Vanzi, Leonardo; Zapata, Abner; Petrovich, Cristobal; Kossakowski, Diana; Rabus, Markus; Rojas, Felipe; Torres, Pascal

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HD 1397b: A Transiting Warm Giant Planet Orbiting A V = 7.8 mag Subgiant Star Discovered by TESS

Brahm, R., Espinoza, N., Jordán, A., Henning, T., Sarkis, P., Jones, M. I., et al. (2019). HD 1397b: A Transiting Warm Giant Planet Orbiting A V = 7.8 mag Subgiant Star Discovered by TESS. The Astronomical Journal, 158.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D403-8 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D404-7

Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019AJ....158...45B (Any fulltext) Open Access status unknown

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Creators:
Brahm, Rafael¹, Author
Espinoza, Néstor¹, Author
Jordán, Andrés¹, Author
Henning, Thomas¹, Author
Sarkis, Paula¹, Author
Jones, Matías I.¹, Author
Díaz, Matías R.¹, Author
Jenkins, James S.¹, Author
Vanzi, Leonardo¹, Author
Zapata, Abner¹, Author
Petrovich, Cristobal¹, Author
Kossakowski, Diana¹, Author
Rabus, Markus¹, Author
Rojas, Felipe¹, Author
Torres, Pascal¹, Author

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1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692

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Free keywords: planetary systems planets and satellites: detection planets and satellites: gaseous planets Astrophysics - Earth and Planetary Astrophysics Astrophysics - Solar and Stellar Astrophysics

Abstract: We report the discovery of a transiting planet first identified as a candidate in Sector 1 of the Transiting Exoplanet Survey Satellite (TESS), and then confirmed with precision radial velocities. HD 1397b has a mass of {M}_{{P}} ={0.367}_-0.023^+0.022 {M}_{{J}}, a radius of {R}_{{P}}={1.023}_-0.013^+0.013 {R}_{{J}}, and orbits its bright host star (V = 7.8 mag) with an orbital period of 11.5366+/- 0.0003 d on a moderately eccentric orbit (e={0.216}_-0.026^+0.027). With a mass of {M}_\star={1.257}_-0.029^+0.029 {M}_ȯ, a radius of {R}_\star={2.341}_-0.019^+0.022 {R}_ȯ, and an age of 4.46+/- 0.25 Gyr, the solar-metallicity host star has already departed from the main sequence. We find evidence in the radial velocity measurements of a secondary signal with a longer period. We attribute it to the rotational modulation of stellar activity, but a long-term radial velocity monitoring would be necessary to discard if this signal is produced by a second planet in the system. The HD 1397 system is among the brightest ones currently known to host a transiting planet, which will make it possible to perform detailed follow-up observations in order to characterize the properties of giant planets orbiting evolved stars.

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Dates: Date issued: 2019

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Title: The Astronomical Journal

Source Genre: Journal

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Pages: - Volume / Issue: 158 Sequence Number: - Start / End Page: - Identifier: -