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ASASSN-18di: discovery of a $ΔV \sim 10$ flare on a mid-M dwarf

Rodríguez, R, Schmidt, SJ, Jayasinghe, T, Stanek, KZ, Prieto, JL, Shappee, B, Kochanek, CS, Thompson, TA, Shields, J, Holoien, TW-S, Bersier, D and Brimacombe, J (2018) ASASSN-18di: discovery of a $ΔV \sim 10$ flare on a mid-M dwarf. Research Notes of the American Astronomical Association RN AAS, 2 (2). ISSN 2515-5172

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We report and characterize a white-light superflare on a previously undiscovered M dwarf detected by the ASAS-SN survey. Employing various color-magnitude and color-spectral type relationships, we estimate several stellar parameters, including the quiescent V-band magnitude, from which we derive a flare amplitude of $\Delta V \sim 10$. We determine an r-band absolute magnitude of $M_{r} = 11.4$, consistent with a mid-M dwarf, and an approximate distance to the source of $2.2$ kpc. Using classical-flare models, we infer a flare energy of $E_{V} \simeq (4.1\pm 2.2)\times 10^{36}$ ergs, making this one of the strongest flares documented on an M dwarf.

Item Type: Article
Uncontrolled Keywords: astro-ph.SR; astro-ph.SR
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
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Date Deposited: 26 Apr 2018 09:53
Last Modified: 04 Sep 2021 02:44
DOI or ID number: 10.3847/2515-5172/aabe7d
URI: https://researchonline.ljmu.ac.uk/id/eprint/8579
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