Peer-reviewedCC BY 4.0The Astrophysical Journal Letters
Pre-nova Observations of T CrB: A View from the CHARA Array
Abstract
T Coronae Borealis (T CrB, HD 143454) is a symbiotic recurrent nova consisting of a red giant and white dwarf with recent eruptions in 1866 and 1946 and an anticipated eruption in the mid-2020s. We report Center for High Angular Resolution Astronomy (or CHARA) Array observations collected with MIRC-X ( H band) and MYSTIC ( K band) in 2022–2025. We fit limb-darkened disk models constrained with literature limb-darkening coefficients to the squared visibilities as only the first visibility lobe is sampled. The average limb-darkened diameter of the star across these epochs is 0.70 ± 0.04 mas in the H band and 0.72 ± 0.07 mas in the K band. Adopting a distance of 91 4 − 22 + 24 pc, the corresponding stellar radius is 69 ± 5 R ⊙ in the H band and 71 ± 8 R ⊙ in the K band. These values are consistent with the Roche-lobe volume radius of 71 R ⊙ inferred from published orbital solutions. These measurements provide a preeruption angular diameter and support a Roche-lobe-filling donor.
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BibTeX
@article{norris2026prenova,
title = {{Pre-nova Observations of T CrB: A View from the CHARA Array}},
author = {Ryan Norris and Narsireddy Anugu and Thomas Gaudin and Magdalena Otulakowska-Hypka and Fabian Kaczmarek and Cameron Caruso and Cody Gustafson and Andrew Kotowski and Rebecca Proni and Nirupam Roy and Fabien Baron and Dipankar P.K Banerjee and Dana Baylis-Aguirre and Michelle Creech-Eakman and Justin Linford and Alexandre Gallenne and Joanna Mikołajewska and John Monnier and Denis Mourard and Ulisse Munari and Nicolas Nardetto and Rachael Roettenbacher and Jennifer Sokoloski and Montana Williams and C. Woodward and Stefan Kraus and Jean-Baptiste Le Bouquin and Sorabh Chhabra and Isabelle Codron and Jacob Ennis and Tyler Gardner and Mayra Gutierrez and Noura Ibrahim and Cyprien Lanthermann and Benjamin Setterholm and Christopher Farrington and Olli Majoinen and Norm Vargas and Douglas Gies and Gail Schaefer and Theo ten Brummelaar},
journal = {The Astrophysical Journal Letters},
year = {2026},
month = jun,
doi = {10.3847/2041-8213/ae71d0},
eprint = {2606.17272},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05791664v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Pre-nova Observations of T CrB: A View from the CHARA Array
AU - Ryan Norris
AU - Narsireddy Anugu
AU - Thomas Gaudin
AU - Magdalena Otulakowska-Hypka
AU - Fabian Kaczmarek
AU - Cameron Caruso
AU - Cody Gustafson
AU - Andrew Kotowski
AU - Rebecca Proni
AU - Nirupam Roy
AU - Fabien Baron
AU - Dipankar P.K Banerjee
AU - Dana Baylis-Aguirre
AU - Michelle Creech-Eakman
AU - Justin Linford
AU - Alexandre Gallenne
AU - Joanna Mikołajewska
AU - John Monnier
AU - Denis Mourard
AU - Ulisse Munari
AU - Nicolas Nardetto
AU - Rachael Roettenbacher
AU - Jennifer Sokoloski
AU - Montana Williams
AU - C. Woodward
AU - Stefan Kraus
AU - Jean-Baptiste Le Bouquin
AU - Sorabh Chhabra
AU - Isabelle Codron
AU - Jacob Ennis
AU - Tyler Gardner
AU - Mayra Gutierrez
AU - Noura Ibrahim
AU - Cyprien Lanthermann
AU - Benjamin Setterholm
AU - Christopher Farrington
AU - Olli Majoinen
AU - Norm Vargas
AU - Douglas Gies
AU - Gail Schaefer
AU - Theo ten Brummelaar
PY - 2026
DA - 2026/06/08
JO - The Astrophysical Journal Letters
DO - 10.3847/2041-8213/ae71d0
UR - https://hal.science/hal-05791664v1
AB - T Coronae Borealis (T CrB, HD 143454) is a symbiotic recurrent nova consisting of a red giant and white dwarf with recent eruptions in 1866 and 1946 and an anticipated eruption in the mid-2020s. We report Center for High Angular Resolution Astronomy (or CHARA) Array observations collected with MIRC-X ( H band) and MYSTIC ( K band) in 2022–2025. We fit limb-darkened disk models constrained with literature limb-darkening coefficients to the squared visibilities as only the first visibility lobe is sampled. The average limb-darkened diameter of the star across these epochs is 0.70 ± 0.04 mas in the H band and 0.72 ± 0.07 mas in the K band. Adopting a distance of 91 4 − 22 + 24 pc, the corresponding stellar radius is 69 ± 5 R ⊙ in the H band and 71 ± 8 R ⊙ in the K band. These values are consistent with the Roche-lobe volume radius of 71 R ⊙ inferred from published orbital solutions. These measurements provide a preeruption angular diameter and support a Roche-lobe-filling donor.
SN - 2041-8205
SN - 2041-8213
ER -