V498 Hya, a new candidate for a period bouncer cataclysmic variable
ABSTRACT V498 Hya (SDSS J084555.07+033929.2) was identified as a short-period cataclysmic variable (CV) by the Catalina Real-Time Transient Survey (CRTS) in 2008. The superhump period was measured during the detected single superoutburst of V498 Hya. The quiescent spectrum subsequently taken by the Sloan Digital Sky Survey-V Milky Way Mapper survey suggested that the CV donor may be a brown dwarf. We present time-resolved follow-up spectroscopy of V498 Hya in quiescence, obtained with the Gran Telescopio Canarias (GTC) Optical System for Imaging and low-intermediate-resolution Integrated Spectroscopy (OSIRIS) spectrograph, from which we derived the 86.053 min spectroscopic period, systemic radial velocity, and the gravitational redshift of the Mg ii line. We also modelled the spectral energy distribution to constrain the system parameters, including the ≥0.82 $\mathrm{ M}_\odot$ mass of the white dwarf and the best-fitting value $0.043\pm 0.004\ \mathrm{M}_\odot$ of the donor star mass. This combination of parameters implies that V498 Hya has evolved past the period minimum and is a relatively rare ‘period bouncer’.
Authors
- A. F. Pala (ORCID: https://orcid.org/0000-0001-7069-7403)
- Vedant Chandra (ORCID: https://orcid.org/0000-0002-0572-8012)
- Odette Toloza (ORCID: https://orcid.org/0000-0002-2398-719X)
- Keith Inight (ORCID: https://orcid.org/0000-0002-2200-2416)
- G. Tovmassian (ORCID: https://orcid.org/0000-0002-2953-7528)
- M. R. Schreiber (ORCID: https://orcid.org/0000-0003-3903-8009)
- Matthew Green (ORCID: https://orcid.org/0000-0002-0948-4801)
- Boris T. Gänsicke (ORCID: https://orcid.org/0000-0002-2761-3005)
Institutions
- European Southern Observatory (DE)
- Tel Aviv University (IL)
- Universidad Autónoma de Baja California (MX)
- European Space Agency (FR)
- University of Warwick (GB)
- European Space Astronomy Centre (ES)
- Center for Astrophysics Harvard & Smithsonian (US)
- Federico Santa María Technical University (CL)
Publication Details
- Journal
- Monthly Notices of the Royal Astronomical Society
- Published
- 2025-02-04
- DOI
- https://doi.org/10.1093/mnras/staf204
- Citations
- 1
- Primary Topic
- Astrophysical Phenomena and Observations
- Type
- article
- Field-Weighted Citation Impact
- 1.15
Funders
- National Science Foundation
- National Aeronautics and Space Administration
- European Commission
- Horizon 2020 Framework Programme
- Science Mission Directorate
- Science and Technology Facilities Council
- Kavli Institute for Theoretical Physics, University of California, Santa Barbara