A Multiwavelength, Multiepoch Monitoring Campaign of Accretion Variability in T Tauri Stars from the ODYSSEUS Survey. I. HST Far-UV and Near-UV Spectra
- Autor(en)
- John Wendeborn, Catherine C. Espaillat, Sophia Lopez, Thanawuth Thanathibodee, Connor E. Robinson, Caeley V. Pittman, Nuria Calvet, Nicole Flors, Fredrick M. Walter, Agnes Kospal, Konstantin N. Grankin, Ignacio Mendigutía, Hans Moritz Gunther, Jochen Eisloffel, Zhen Guo, Kevin France, Eleonora Fiorellino, William J. Fischer, Peter Abraham, Gregory J. Herczeg
- Abstrakt
The classical T Tauri star (CTTS) stage is a critical phase of the star and planet formation process. In an effort to better understand the mass accretion processes, which can dictate future stellar evolution and planet formation, a multiepoch, multiwavelength photometric and spectroscopic monitoring campaign of four CTTSs (TW Hya, RU Lup, BP Tau, and GM Aur) was carried out in 2021 and 2022/2023 as part of the Outflows and Disks around Young Stars: Synergies for the Exploration of ULLYSES Spectra program. Here we focus on the Hubble Space Telescope (HST) UV spectra obtained by the HST Director’s Discretionary Time UV Legacy Library of Young Stars as Essential Standards (ULLYSES) program. Using accretion shock modeling, we find that all targets exhibit accretion variability, varying from short increases in accretion rate by up to a factor of 3 within 48 hr to longer decreases in accretion rate by a factor of 2.5 over the course of 1 yr. This is despite the generally consistent accretion morphology within each target. Additionally, we test empirical relationships between accretion rate and UV luminosity and find stark differences, showing that these relationships should not be used to estimate the accretion rate for an individual target. Our work reinforces that future multiepoch and simultaneous multiwavelength studies are critical in our understanding of the accretion process in low-mass star formation.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Boston University, Amherst College, University of Michigan, State University of New York, Stony Brook, MTA Társadalomtudományi Kutatóközpont, Eötvös Loránd University Budapest, Max-Planck-Institut für Astronomie, Russian Academy of Sciences, CSIC - Real Jardin Botanico (RJB), Massachusetts Institute of Technology, Thüringer Landessternwarte Tautenburg, Universidad de Valparaíso, University of Colorado, Boulder, INAF-Osservatorio Astronomico di Capodimonte, Space Telescope Science Institute, HUN-REN Magyar Kutatási Hálózat, Peking University
- Journal
- Astrophysical Journal
- Band
- 970
- Anzahl der Seiten
- 31
- ISSN
- 0004-637X
- DOI
- https://doi.org/10.3847/1538-4357/ad4a62
- Publikationsdatum
- 08-2024
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie, 103004 Astrophysik
- ASJC Scopus Sachgebiete
- Astronomy and Astrophysics, Space and Planetary Science
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/a132b1b3-9556-4f8c-8f13-853cf565fa44