J 2024

Stellar obliquity measurements of six gas giants: Orbital misalignment of WASP-101b and WASP-131b

ZAK, J., A. BOCCHIERI, E. SEDAGHATI, H. M. J. BOFFIN, Z. PRUDIL et. al.

Basic information

Original name

Stellar obliquity measurements of six gas giants: Orbital misalignment of WASP-101b and WASP-131b

Authors

ZAK, J., A. BOCCHIERI, E. SEDAGHATI, H. M. J. BOFFIN, Z. PRUDIL, M. SKARKA, Q. CHANGEAT, E. PASCALE, D. ITRICH, V. D. IVANOV, Michaela VÍTKOVÁ (203 Czech Republic, belonging to the institution), P. KABATH, M. ROTH and A. HATZES

Edition

Astronomy and Astrophysics, EDP Sciences, 2024, 0004-6361

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 6.500 in 2022

Organization unit

Faculty of Science

DOI

UT WoS

001243387100001

Keywords in English

techniques: radial velocities; planets and satellites: atmospheres; planets and satellites: gaseous planets; planet-star interactions

Tags

Tags

International impact, Reviewed
Změněno: 15/7/2024 15:41, Mgr. Marie Šípková, DiS.

Abstract

V originále

One can infer the orbital alignment of exoplanets with respect to the spin of their host stars using the Rossiter-McLaughlin effect, thereby giving us the chance to test planet formation and migration theories and improve our understanding of the currently observed population. We analyzed archival HARPS and HARPS-N spectroscopic transit time series of six gas giant exoplanets on short orbits, namely WASP-77 Ab, WASP-101b, WASP-103b, WASP-105b, WASP-120b, and WASP-131b. We find a moderately misaligned orbit for WASP-101b (lambda = 34 degrees +/- 3) and a highly misaligned orbit for WASP-131b (lambda = 161 degrees +/- 5), while the four remaining exoplanets appear to be aligned: WASP-77 Ab (lambda = -8 degrees(+19)(-18)), WASP-103b (lambda = -2 degrees(+35)(-36)), WASP-105b (lambda = -14 degrees(+28)(-24)), and WASP-120b (lambda = -2 degrees +/- 4). For WASP-77 Ab, we are able to infer its true orbital obliquity (Psi = 48 degrees(+22)(-21)). We additionally performed transmission spectroscopy of the targets in search of strong atomic absorbers in the exoatmospheres, but were unable to detect any features, most likely due to the presence of high-altitude clouds or Rayleigh scattering muting the strength of the features. Finally, we comment on future perspectives on studying these planets with upcoming space missions to investigate their evolution and migration histories.