TY - JOUR
T1 - HD 1397b
T2 - A Transiting Warm Giant Planet Orbiting A v = 7.8 mag Subgiant Star Discovered by TESS
AU - Brahm, Rafael
AU - Espinoza, Néstor
AU - Jordán, Andrés
AU - Henning, Thomas
AU - Sarkis, Paula
AU - Jones, Matias I.
AU - Diaz, Matias R.
AU - Jenkins, James S.
AU - Vanzi, Leonardo
AU - Zapata, Abner
AU - Petrovich, Cristobal
AU - Kossakowski, Diana
AU - Rabus, Markus
AU - Rojas, Felipe
AU - Torres, Pascal
N1 - Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved..
PY - 2019
Y1 - 2019
N2 - 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 , a radius of , and orbits its bright host star (V = 7.8 mag) with an orbital period of d on a moderately eccentric orbit (). With a mass of , a radius of , and an age of 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.
AB - 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 , a radius of , and orbits its bright host star (V = 7.8 mag) with an orbital period of d on a moderately eccentric orbit (). With a mass of , a radius of , and an age of 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.
KW - planetary systems
KW - planets and satellites: detection
KW - planets and satellites: gaseous planets
UR - http://www.scopus.com/inward/record.url?scp=85072394390&partnerID=8YFLogxK
U2 - 10.3847/1538-3881/ab279a
DO - 10.3847/1538-3881/ab279a
M3 - Article
AN - SCOPUS:85072394390
SN - 0004-6256
VL - 158
JO - Astronomical Journal
JF - Astronomical Journal
IS - 1
M1 - 45
ER -