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

Hellard, Hugo and Csizmadia, Szilard and Padovan, Sebastiano and Sohl, Frank (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

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

Abstract

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
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hellard, HugoHugo.Hellard (at) dlr.deUNSPECIFIED
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Padovan, SebastianoSebastiano.Padovan (at) dlr.deUNSPECIFIED
Sohl, FrankFrank.Sohl (at) dlr.deUNSPECIFIED
Date:January 2020
Journal or Publication Title:The Astrophysical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:889
DOI :10.3847/1538-4357/ab616e
Publisher:American Astronomical Society
ISSN:0004-637X
Status:Published
Keywords:HST Photometry, Planetary interior, Hot jupiters
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt COROT Beteiligung
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Planetary Physics
Deposited By: Hellard, Hugo
Deposited On:03 Feb 2020 07:53
Last Modified:03 Feb 2020 07:53

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