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Planetary interiors via Love numbers determined from radial velocities

Bernabo, Lia Marta and Csizmadia, Szilard (2022) Planetary interiors via Love numbers determined from radial velocities. COSPAR 2022, 2022-07-17 - 2022-07-23, Athens, Greece.

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We study the inner structure of exoplanets by determining the Love numbers kn and hn, which describe the susceptibility of their shape to change in response to a tidal and rotational potential. The second degree Love number k2 is highly sensitive to the thickness of the interior layers and rheology of the planet and it is proportional to the concentration of mass towards the centre of the planet, therefore it is used to infer the internal structure of the body. We will present the method how to analyze the radial velocity curve in presence of apsidal motion caused by tidal interaction between the star and the planet, and by general relativity. The former one can be linked to the Love number k2 which constrains the planetary interior as a third measurable parameter beyond the mass and radius. We also study the effect of the rotationally and tidally distorted stellar shape on the radial velocity (RV) curves. This causes distortion on the RV shape as well, and leads to the presence of an apparent eccentric orbit in the RV curve. We show that the correct estimate of this effect must be taken into account and some earlier studies overestimated its amplitude and significance. Finally, we show our first results when we applied our method to real exoplanetary systems

Item URL in elib:https://elib.dlr.de/188914/
Document Type:Conference or Workshop Item (Speech)
Title:Planetary interiors via Love numbers determined from radial velocities
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bernabo, Lia MartaUNSPECIFIEDhttps://orcid.org/0000-0002-8035-1032UNSPECIFIED
Csizmadia, SzilardUNSPECIFIEDhttps://orcid.org/0000-0001-6803-9698UNSPECIFIED
Date:July 2022
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Love numbers, exoplanets, tidal interaction, internal structure, periastron precession
Event Title:COSPAR 2022
Event Location:Athens, Greece
Event Type:international Conference
Event Start Date:17 July 2022
Event End Date:23 July 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Bernabo, Lia Marta
Deposited On:31 Oct 2022 14:34
Last Modified:24 Apr 2024 20:50

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