Small planets transiting A-type stars with TESS Virtual Observatory Resource

Authors
  1. Giacalone S.
  2. Dressing C.D.
  3. Published by
    CDS
Abstract

The Kepler and K2 missions enabled robust calculations of planet occurrence rates around FGKM-type stars. However, these missions observed too few stars with earlier spectral types to tightly constrain the occurrence rates of planets orbiting hotter stars. Using TESS, we calculate the occurrence rate of small(1R_{Earth}_<R_p_<8R_{Earth}_), close-in (P_orb_<10d) planets orbiting A-type stars for the first time. We search a sample of 20,257 bright (6<T<10) A-type stars for transiting planets using a custom pipeline and vet the detected signals, finding no reliable small planets. We characterize the pipeline completeness using injection-recovery tests and determine the 3{sigma} upper limits of the occurrence rates of close-in sub-Saturns (4R_{Earth}_<R_p_<8R_{Earth}_), sub-Neptunes (2R_{Earth}_<R_p_<4R_{Earth}_), and super-Earths (1R_{Earth}_<R_p_<2R_{Earth}_). We find upper limits of 2.2+/-0.4 sub-Saturns and 9.1+/-1.8 sub-Neptunes per 1000 A-type stars, which may be more than 3x and 6x lower than Kepler-era estimates for Sun-like stars. We calculate an upper limit of 186+/-34 super-Earths per 1000 A-type stars, which may be more than 1.5x lower than that for M dwarfs. Our results hint that small, close-in planets become rarer around early-type stars and that their occurrence rates decrease faster than that of hot Jupiters with increasing host star temperature. We discuss plausible explanations for these trends, including star-disk interactions and enhanced photoevaporation of planet atmospheres.

Keywords
  1. a-stars
  2. infrared-photometry
  3. visible-astronomy
  4. exoplanets
Bibliographic source Bibcode
2025AJ....169...45G
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/45
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/169/45

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https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/169/45
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/169/45
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https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/45/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/45/table1?

History

2025-11-14T08:53:24Z
Resource record created
2025-11-14T08:53:24Z
Created
2025-11-17T12:15:50Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr