Short-period pulsating hot-subdwarf stars observed by TESS in Sectors 61–97
Abstract
We present results of a continuation of the search, started by Baran et al. (2023, 2024), for short-period pulsations in compact stellar objects observed during Sectors 61–97 of the TESS mission. We use newly collected and other unpublished spectroscopic data to confirm or determine spectral classification of many stars included in this work. From the TESS photometry, we identify 36 short-period hot-subdwarf pulsators, including 33 pulsators not known before the TESS mission. We present the results in a similar way to Baran et al. (2024). We provide an update on the instability strip and the evolutionary status of hot subdwarf stars with a more populated Kiel diagram. We discuss hybrid candidates as well as the results of testing correlations between theoretical predictions of the highest amplitude pulsation modes and spectroscopic parameters of stars found to be pressure-mode (p-mode) pulsators in the TESS mission. We report the discovery of the first p-mode dominated V366 Aqr – type star, the first helium-enhanced hot subdwarf pulsator, and an unusual blue large-amplitude pulsator. We revise a classification of a previously reported BLAP star and correct the final TESS p-mode star statistics by accounting for a new spectral classification of two hot subdwarfs.
Related
- A Potential Signature of HD 7977’s Passage among Observed Long-period Comet Orbits
- Mass constraints for the K2-223 system planets: An ultra-short-period sub-Earth, a short-period super-Earth, and a tentative long-period giant planet
- Short-timescale X-ray variability of the blazar 1ES 1959+650 observed with AstroSat/SXT
- On the origin of the short-period Blue Straggler Stars in Collinder 261: a binary evolution approach
- A precise TESS ephemeris for the short-period binary TIC-259864042
BibTeX
@article{baran2026shortperiod,
title = {{Short-period pulsating hot-subdwarf stars observed by TESS in Sectors 61–97}},
author = {Andrzej Baran and Roy Østensen and Stephane Charpinet and Hannah Worters and John Telting and David Kilkenny},
journal = {Publications of the Astronomical Society of Australia},
year = {2026},
month = aug,
doi = {10.1017/pasa.2026.10242},
url = {https://hal.science/hal-05801748v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Short-period pulsating hot-subdwarf stars observed by TESS in Sectors 61–97
AU - Andrzej Baran
AU - Roy Østensen
AU - Stephane Charpinet
AU - Hannah Worters
AU - John Telting
AU - David Kilkenny
PY - 2026
DA - 2026/08/03
JO - Publications of the Astronomical Society of Australia
DO - 10.1017/pasa.2026.10242
UR - https://hal.science/hal-05801748v1
AB - We present results of a continuation of the search, started by Baran et al. (2023, 2024), for short-period pulsations in compact stellar objects observed during Sectors 61–97 of the TESS mission. We use newly collected and other unpublished spectroscopic data to confirm or determine spectral classification of many stars included in this work. From the TESS photometry, we identify 36 short-period hot-subdwarf pulsators, including 33 pulsators not known before the TESS mission. We present the results in a similar way to Baran et al. (2024). We provide an update on the instability strip and the evolutionary status of hot subdwarf stars with a more populated Kiel diagram. We discuss hybrid candidates as well as the results of testing correlations between theoretical predictions of the highest amplitude pulsation modes and spectroscopic parameters of stars found to be pressure-mode (p-mode) pulsators in the TESS mission. We report the discovery of the first p-mode dominated V366 Aqr – type star, the first helium-enhanced hot subdwarf pulsator, and an unusual blue large-amplitude pulsator. We revise a classification of a previously reported BLAP star and correct the final TESS p-mode star statistics by accounting for a new spectral classification of two hot subdwarfs.
SN - 1323-3580
SN - 1448-6083
ER -