Obliquities of exoplanet host stars: Nineteen new and updated measurements, and trends in the sample of 205 measurements
Artikel i vetenskaplig tidskrift, 2024

Measurements of the obliquities in exoplanet systems have revealed some remarkable architectures, some of which are very different from the Solar System. Nearly 200 obliquity measurements have been obtained through observations of the Rossiter McLaughlin (RM) effect. Here, we report on observations of 19 planetary systems that led to 17 clear detections of the RM effect and 2 less secure detections. After adding the new measurements to the tally, we used the entire collection of RM measurements to investigate four issues that have arisen in the literature. i) Does the obliquity distribution show a peak at approximately 90 ? We find tentative evidence that such a peak does exist when restricting attention to the sample of sub-Saturn planets and hot Jupiters orbiting F stars. ii) Are high obliquities associated with high eccentricities? We find the association to be weaker than previously reported, and that a stronger association exists between obliquity and orbital separation, possibly due to tidal obliquity damping at small separations. iii) How low are the lowest known obliquities? Among hot Jupiters around cool stars, we find the dispersion to be 1.4 ± 0.7, smaller than the 6 obliquity of the Sun, which serves as additional evidence for tidal damping. iv) What are the obliquities of stars with compact and flat systems of multiple planets? We find that they generally have obliquities lower than 10, with several remarkable exceptions possibly caused by wide-orbiting stellar or planetary companions.

Planets and satellites: formation

Planet-star interactions

Planets and satellites: dynamical evolution and stability

Författare

Emil Knudstrup

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Aarhus Universitet

Simon Albrecht

Aarhus Universitet

Princeton University

J. N. Winn

Princeton University

D. Gandolfi

Universita degli Studi di Torino

J. J. Zanazzi

University of California

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Malcolm Fridlund

Universiteit Leiden

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

M. L. Marcussen

Aarhus Universitet

A. Chontos

University of Hawaii

Princeton University

Marcelo Aron Fetzner Keniger

The University of Warwick

N. L. Eisner

Flatiron Institute

Allyson Bieryla

Harvard-Smithsonian Center for Astrophysics

H. Isaacson

University of California

A. W. Howard

California Institute of Technology (Caltech)

L.A. Hirsch

University of Toronto

F. Murgas

Universidad de la Laguna

Instituto de Astrofísica de Canarias

Norio Narita

National Institutes of Natural Sciences

Instituto de Astrofísica de Canarias

University of Tokyo

Enric Palle

Universidad de la Laguna

Instituto de Astrofísica de Canarias

Yugo Kawai

University of Tokyo

D. Baker

Austin College

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 690 A379

Ämneskategorier (SSIF 2011)

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/202450627

Relaterade dataset

Additional tables: Obliquities of exoplanet host stars. Nineteen new, updated measurements for the sample of 205 measurements and observed trends [dataset]

DOI: 10.5281/zenodo.13589368

Mer information

Senast uppdaterat

2025-03-10