DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

HST/STIS Capability for Love Number measurement of WASP-121b

Hellard, Hugo and Csizmadia, Szilard and Padovan, Sebastiano and Sohl, Frank and Rauer, H (2020) HST/STIS Capability for Love Number measurement of WASP-121b. The Astrophysical Journal, 889 (1). American Astronomical Society. doi: 10.3847/1538-4357/ab616e. ISSN 0004-637X.

[img] PDF - Published version

Official URL: https://iopscience.iop.org/article/10.3847/1538-4357/ab616e


Data from transit light curves, radial velocity, and transit timing observations can be used to probe the interiors of exoplanets beyond the mean density, by measuring the Love numbers h 2 and k 2. The first indirect estimate of k 2 for an exoplanet from radial velocity and transit timing variation observations has been performed by taking advantage of the years-spanning baseline. Not a single measurement of h 2 has been achieved from transit light curves, mostly because the photometric precision of current observing facilities is still too low. We show that the Imaging Spectrograph instrument onboard the Hubble Space Telescope (HST) could measure h 2 of the hot Jupiter WASP-121b if only a few more observations were gathered. We show that a careful treatment of the noise and stellar limb darkening (LD) must be carried out to achieve a measurement of h 2. In particular, we find that the impact of the noise modeling on the estimation of h 2 is stronger than that of the LD modeling. In addition, we emphasize that the wavelet method for correlated noise analysis can mask limb brightening. Finally, using currently available data, we briefly discuss the tentative measurement of ${h}_{2}={1.39}_{-0.81}^{+0.71}$ in terms of interior structure. Additional observations would further constrain the interior of WASP-121b and possibly provide insights on the physics of inflation. The possibility of using the approach presented here with the HST provides a bridge before the high-quality data to be returned by the James Webb Space Telescope and PLATO telescope in the coming decade.

Item URL in elib:https://elib.dlr.de/133899/
Document Type:Article
Title:HST/STIS Capability for Love Number measurement of WASP-121b
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Sohl, FrankUNSPECIFIEDhttps://orcid.org/0000-0003-0355-1556UNSPECIFIED
Date:January 2020
Journal or Publication Title:The Astrophysical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Astronomical Society
Keywords:HST Photometry, Planetary interior, Hot jupiters
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 - Projekt COROT Beteiligung (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Hellard, Hugo
Deposited On:03 Feb 2020 07:53
Last Modified:27 Oct 2023 14:48

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.