TESS Science Conference 2
Published July 24, 2021 | Version version 1
Poster Open

TOI-1830 and TOI-1312: Two EBs hosting very low-mass stellar companions in eccentric orbits

Creators

  • 1. Departamento de Matemática y Física Aplicadas, Universidad Católica de la Santísima Concepción, Alonso de Rivera 2850, Concepción, Chile
  • 2. Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
  • 3. Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA
  • 4. Las Cumbres Observatory, 6740 Cortona Dr., Ste. 102, Goleta, CA 93117, USA
  • 5. Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, China
  • 6. Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Marrakech, Morocco
  • 7. Department of Physics and Astronomy, University of Louisville, Louisville, KY 40292, USA
  • 8. University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
  • 9. University of Southern Queensland, Centre for Astrophysics, USQ Toowoomba, West Street, QLD 4350 Australia
  • 10. DTU Space, National Space Institute, Technical University of Denmark, Elektrovej 328, DK-2800 Kgs. Lyngby, Denmark
  • 11. NASA Exoplanet Science Institute/Caltech-IPAC, 1200 E. California Blvd, Pasadena, CA 91125, USA
  • 12. NASA Ames Research Center, Moffett Field, CA 94035, USA
  • 13. Caltech/IPAC-NASA Exoplanet Science Institute, 770 S. Wilson Avenue, Pasadena, CA 91106, USA
  • 14. Astrophysics Group, Keele University, Staffordshire ST5 5BG, U.K
  • 15. Astrobiology Research Unit, Université de Liège, Allée du 6 Aout 19C B-4000 Liège, Belgium

Description

We describe in the underlying investigation the discovery of two eclipsing binary systems. In both cases, the companions are most likely fully convective low-mass stars. The TESS team initially alerted the systems as TOI-1830 (TIC20182165, HD133725) and TOI-1312 (TIC405904232), and we subsequently observed them with spectroscopy. The TESS light curves and spectroscopic observations were analyzed in a combined data-driven framework to estimate the systems’ parameters. Radial velocity (RV) measurements with LCO/NRES, NOT/FIES, SONG, and TRES indicated for the TOI-1830 system a companion mass of 0.11 M☉ in a 9.781-day eccentric orbit and a 0.10 M☉ companion in an 11.080-day eccentric orbit for the TOI-1312 system. At the same time, the spectroscopic observations were used to estimate the spectral type of the main stars for TOI-1830 and TOI-1312. We measured the radii ratio from the TESS light curves and estimated the companions’ radii, assuming the main stars’ radii as measured from spectroscopy and isochrones. Given the youth of TOI-1830 and the evolved age of TOI-1312, both systems will provide valuable insights into the stellar evolution of close binary systems.

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