Precise masses for the transiting planetary system HD 106315 with HARPS

Context. The multi-planetary system HD 106315 was recently found in K2 data. The planets have periods of P b ∼ 9.55 and P c ∼ 21.06 days, and radii of r b = 2.44 ± 0.17 R ⊕ and r c = 4.35 ± 0.23 R ⊕ . The brightness of the host star (V = 9.0 mag) makes it an excellent target for transmission spectro...

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Publicado:	2017
Materias:	Planets and satellites: Composition Planets and satellites: Detection Planets and satellites: Fundamental parameters Stars: Individual: HD 106315 Techniques: Photometric Techniques: Radial velocities Atmospheric composition Digital television Flexible couplings Lead Photometry Planets Stars Planets and satellites: compositions Planets and satellites: detections Planets and satellites: fundamental parameters Stars: individual Techniques: photometric Techniques: radial velocities Satellites
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v608_n_p_Barros http://hdl.handle.net/20.500.12110/paper_00046361_v608_n_p_Barros
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00046361_v608_n_p_Barros
record_format	dspace
spelling	paper:paper_00046361_v608_n_p_Barros2023-06-08T14:28:23Z Precise masses for the transiting planetary system HD 106315 with HARPS Planets and satellites: Composition Planets and satellites: Detection Planets and satellites: Fundamental parameters Stars: Individual: HD 106315 Techniques: Photometric Techniques: Radial velocities Atmospheric composition Digital television Flexible couplings Lead Photometry Planets Stars Planets and satellites: compositions Planets and satellites: detections Planets and satellites: fundamental parameters Stars: individual Techniques: photometric Techniques: radial velocities Satellites Context. The multi-planetary system HD 106315 was recently found in K2 data. The planets have periods of P b ∼ 9.55 and P c ∼ 21.06 days, and radii of r b = 2.44 ± 0.17 R ⊕ and r c = 4.35 ± 0.23 R ⊕ . The brightness of the host star (V = 9.0 mag) makes it an excellent target for transmission spectroscopy. However, to interpret transmission spectra it is crucial to measure the planetary masses. Aims. We obtained high precision radial velocities for HD 106315 to determine the mass of the two transiting planets discovered with Kepler K2. Our successful observation strategy was carefully tailored to mitigate the effect of stellar variability. Methods. We modelled the new radial velocity data together with the K2 transit photometry and a new ground-based partial transit of HD 106315c to derive system parameters. Results. We estimate the mass of HD 106315b to be 12.6 ± 3.2 M ⊕ and the density to be 4.7 ± 1.7 g cm -3 , while for HD 106315c we estimate a mass of 15.2 ± 3.7 M ⊕ and a density of 1.01 ± 0.29 g cm -3 . Hence, despite planet c having a radius almost twice as large as planet b, their masses are consistent with one another. Conclusions. We conclude that HD 106315c has a thick hydrogen-helium gaseous envelope. A detailed investigation of HD 106315b using a planetary interior model constrains the core mass fraction to be 5-29%, and the water mass fraction to be 10-50%. An alternative, not considered by our model, is that HD 106315b is composed of a large rocky core with a thick H-He envelope. Transmission spectroscopy of these planets will give insight into their atmospheric compositions and also help constrain their core compositions. © ESO, 2017. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v608_n_p_Barros http://hdl.handle.net/20.500.12110/paper_00046361_v608_n_p_Barros
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Planets and satellites: Composition Planets and satellites: Detection Planets and satellites: Fundamental parameters Stars: Individual: HD 106315 Techniques: Photometric Techniques: Radial velocities Atmospheric composition Digital television Flexible couplings Lead Photometry Planets Stars Planets and satellites: compositions Planets and satellites: detections Planets and satellites: fundamental parameters Stars: individual Techniques: photometric Techniques: radial velocities Satellites
spellingShingle	Planets and satellites: Composition Planets and satellites: Detection Planets and satellites: Fundamental parameters Stars: Individual: HD 106315 Techniques: Photometric Techniques: Radial velocities Atmospheric composition Digital television Flexible couplings Lead Photometry Planets Stars Planets and satellites: compositions Planets and satellites: detections Planets and satellites: fundamental parameters Stars: individual Techniques: photometric Techniques: radial velocities Satellites Precise masses for the transiting planetary system HD 106315 with HARPS
topic_facet	Planets and satellites: Composition Planets and satellites: Detection Planets and satellites: Fundamental parameters Stars: Individual: HD 106315 Techniques: Photometric Techniques: Radial velocities Atmospheric composition Digital television Flexible couplings Lead Photometry Planets Stars Planets and satellites: compositions Planets and satellites: detections Planets and satellites: fundamental parameters Stars: individual Techniques: photometric Techniques: radial velocities Satellites
description	Context. The multi-planetary system HD 106315 was recently found in K2 data. The planets have periods of P b ∼ 9.55 and P c ∼ 21.06 days, and radii of r b = 2.44 ± 0.17 R ⊕ and r c = 4.35 ± 0.23 R ⊕ . The brightness of the host star (V = 9.0 mag) makes it an excellent target for transmission spectroscopy. However, to interpret transmission spectra it is crucial to measure the planetary masses. Aims. We obtained high precision radial velocities for HD 106315 to determine the mass of the two transiting planets discovered with Kepler K2. Our successful observation strategy was carefully tailored to mitigate the effect of stellar variability. Methods. We modelled the new radial velocity data together with the K2 transit photometry and a new ground-based partial transit of HD 106315c to derive system parameters. Results. We estimate the mass of HD 106315b to be 12.6 ± 3.2 M ⊕ and the density to be 4.7 ± 1.7 g cm -3 , while for HD 106315c we estimate a mass of 15.2 ± 3.7 M ⊕ and a density of 1.01 ± 0.29 g cm -3 . Hence, despite planet c having a radius almost twice as large as planet b, their masses are consistent with one another. Conclusions. We conclude that HD 106315c has a thick hydrogen-helium gaseous envelope. A detailed investigation of HD 106315b using a planetary interior model constrains the core mass fraction to be 5-29%, and the water mass fraction to be 10-50%. An alternative, not considered by our model, is that HD 106315b is composed of a large rocky core with a thick H-He envelope. Transmission spectroscopy of these planets will give insight into their atmospheric compositions and also help constrain their core compositions. © ESO, 2017.
title	Precise masses for the transiting planetary system HD 106315 with HARPS
title_short	Precise masses for the transiting planetary system HD 106315 with HARPS
title_full	Precise masses for the transiting planetary system HD 106315 with HARPS
title_fullStr	Precise masses for the transiting planetary system HD 106315 with HARPS
title_full_unstemmed	Precise masses for the transiting planetary system HD 106315 with HARPS
title_sort	precise masses for the transiting planetary system hd 106315 with harps
publishDate	2017
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v608_n_p_Barros http://hdl.handle.net/20.500.12110/paper_00046361_v608_n_p_Barros
_version_	1768542915682893824

Precise masses for the transiting planetary system HD 106315 with HARPS

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