Discovery of the pre-main-sequence eclipsing binary MML 48
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2025
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| author | Chew, Y. Gómez Maqueo Hebb, L. Stempels, H. C. Walter, F. M. James, D. J. Feiden, G. A. Petrucci, R. Lister, T. Baraffe, I. Brodheim, M. Faedi, F. Anderson, D. R. Street, R. A. Hellier, C. Stassun, K. G. |
| author_facet | Chew, Y. Gómez Maqueo Hebb, L. Stempels, H. C. Walter, F. M. James, D. J. Feiden, G. A. Petrucci, R. Lister, T. Baraffe, I. Brodheim, M. Faedi, F. Anderson, D. R. Street, R. A. Hellier, C. Stassun, K. G. |
| contents | We present the discovery of the eclipsing binary MML 48, which is a member of Upper Centaurus Lupus, has an associated age of 16 Myr, and is composed of two young, low-mass stars. We used space- and ground-based observations to characterize the system with both time-series photometry and spectroscopy. Given the extreme mass ratio between the stars, q_EB = 0.209 +- 0.014, we modeled a single-lined spectroscopic and eclipsing binary system. The orbital period, 2.0171068 +- 0.0000004 d, is measured from the highest precision light curves. We derive a primary mass of 1.2 +- 0.07 Msun using stellar models, and with radial velocities we measured a secondary mass of 0.2509 +- 0.0078 Msun. The radii are large, as expected for pre-main-sequence stars, and are measured as 1.574 +- 0.026 +- 0.050 Rsun and 0.587 +- 0.0095 +- 0.050 Rsun, for the primary and secondary stars, respectively. MML 48 joins the short list of known low-mass, pre-main-sequence eclipsing binaries (EBs), being one of only five systems with intermediate ages (15-25 Myr), and the system with the most extreme mass ratio. The primary star is currently at the "fusion bump", undergoing an over-production of energy in the core due to the build-up of 3He before reaching its equilibrium abundance set by the proton-proton (p-p) I chain. MML 48 A is the first young star in an eclipsing system that has been found during its fusion bump. MML 48 is thus an important benchmark for low-mass stellar evolution at a time when the stars are rapidly changing, which allows for a tight constraint on the corresponding isochrone given the uneven mass ratio. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_03831 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Discovery of the pre-main-sequence eclipsing binary MML 48 Chew, Y. Gómez Maqueo Hebb, L. Stempels, H. C. Walter, F. M. James, D. J. Feiden, G. A. Petrucci, R. Lister, T. Baraffe, I. Brodheim, M. Faedi, F. Anderson, D. R. Street, R. A. Hellier, C. Stassun, K. G. Solar and Stellar Astrophysics We present the discovery of the eclipsing binary MML 48, which is a member of Upper Centaurus Lupus, has an associated age of 16 Myr, and is composed of two young, low-mass stars. We used space- and ground-based observations to characterize the system with both time-series photometry and spectroscopy. Given the extreme mass ratio between the stars, q_EB = 0.209 +- 0.014, we modeled a single-lined spectroscopic and eclipsing binary system. The orbital period, 2.0171068 +- 0.0000004 d, is measured from the highest precision light curves. We derive a primary mass of 1.2 +- 0.07 Msun using stellar models, and with radial velocities we measured a secondary mass of 0.2509 +- 0.0078 Msun. The radii are large, as expected for pre-main-sequence stars, and are measured as 1.574 +- 0.026 +- 0.050 Rsun and 0.587 +- 0.0095 +- 0.050 Rsun, for the primary and secondary stars, respectively. MML 48 joins the short list of known low-mass, pre-main-sequence eclipsing binaries (EBs), being one of only five systems with intermediate ages (15-25 Myr), and the system with the most extreme mass ratio. The primary star is currently at the "fusion bump", undergoing an over-production of energy in the core due to the build-up of 3He before reaching its equilibrium abundance set by the proton-proton (p-p) I chain. MML 48 A is the first young star in an eclipsing system that has been found during its fusion bump. MML 48 is thus an important benchmark for low-mass stellar evolution at a time when the stars are rapidly changing, which allows for a tight constraint on the corresponding isochrone given the uneven mass ratio. |
| title | Discovery of the pre-main-sequence eclipsing binary MML 48 |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2509.03831 |