2022ApJ...933L..25A -
Astrophys. J., 933, L25-L25 (2022/July-1)
Faint Debris Disk Peering through the Superflare Light Echo.
ARIMATSU K. and KAMIZUKA T.
Abstract (from CDS):
We present the detectability of strong mid-infrared (MIR) light echoes from faint debris disks illuminated by bright superflares of M-dwarf stars. Circumstellar dust grains around an M-dwarf star are simultaneously heated by superflare radiation. One can thus expect their re-emission in the MIR wavelength regime. According to our model calculations for the Proxima Centauri system, the nearest M-dwarf star system, thermal emission echoes from an inner (r < 1 au) debris disk with a total mass down to that of the solar system's zodiacal dust are expected to emerge at wavelengths longer than ∼10 µm with a strength comparable to or greater than a white-light superflare. Also, observable echoes from inner- (r <= 0.5 au) debris disks irradiated by energetic ( >=1033.5 erg) superflares of nearby (D < 3 pc) M dwarfs are expected. Our simulation results indicate that superflare monitoring using high-speed optical instruments like OASES and its prompt follow-up using ground-based MIR instruments, such as TAO/MIMIZUKU, can detect these MIR light echoes from debris disks around solar neighborhood flare stars.
Abstract Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
Debris disks - Flare stars - Time domain astronomy - Observational astronomy
Simbad objects:
2
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