TIC 114936199: A Quadruple Star System with a 12 Day Outer-orbit Eclipse

0563241 - ASÚ 2023 RIV GB eng J - Journal Article
Powell, B. P. - Rappaport, S. A. - Borkovits, T. - Kostov, B.V. - Torres, G. - Jayaraman, R. - Latham, D. W. - Kučáková, Hana - Garai, Z. - Pribulla, T. - Vanderburg, A. - Kruse, E. - Barclay, T. - Olmschenk, G. - Kristiansen, Martti H. K. - Gagliano, R. - Jacobs, T. L. - LaCourse, D. M. - Omohundro, M. - Schwengeler, H. M. - Terentev, I. A. - Schmitt, A. R.
TIC 114936199: A Quadruple Star System with a 12 Day Outer-orbit Eclipse.
Astrophysical Journal. Roč. 938, č. 2 (2022), č. článku 133. ISSN 0004-637X. E-ISSN 1538-4357
Institutional support: RVO:67985815
Keywords : radial-velocities * stellar tracks * triple stars
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 4.9, year: 2022
Method of publishing: Open access

We report the discovery with TESS of a remarkable quadruple star system with a 2+1+1 configuration. The two unique characteristics of this system are that (i) the inner eclipsing binary (stars Aa and Ab) eclipses the star in the outermost orbit (star C), and (ii) these outer fourth-body eclipses last for similar to 12 days, the longest of any such system known. The three orbital periods are similar to 3.3 days, similar to 51 days, and similar to 2100 days. The extremely long duration of the outer eclipses is due to the fact that star B slows binary A down on the sky relative to star C. We combine TESS photometric data, ground-based photometric observations, eclipse timing points, radial velocity measurements, the composite spectral energy distribution, and stellar isochrones in a spectrophotodynamical analysis to deduce all of the basic properties of the four stars (mass, radius, T (eff), and age), as well as the orbital parameters for all three orbits. The four masses are M (Aa) = 0.382 M (circle dot), M (Ab) = 0.300 M (circle dot), M (B) = 0.540 M (circle dot), and M (C) = 0.615 M (circle dot), with a typical uncertainty of 0.015 M (circle dot).
Permanent Link: https://hdl.handle.net/11104/0337513