Discovery of an Extremely Short Duration Flare from Proxima Centauri Using Millimeter through Far-ultraviolet Observations

被引：56

作者：

MacGregor, Meredith A. ^{[1
]}

Weinberger, Alycia J. ^{[2
]}

Loyd, R. O. Parke ^{[3
]}

Shkolnik, Evgenya ^{[3
]}

Barclay, Thomas ^{[4
,5
]}

Howard, Ward S. ^{[6
]}

Zic, Andrew ^{[7
,8
]}

Osten, Rachel A. ^{[9
,10
]}

Cranmer, Steven R. ^{[1
,12
]}

Kowalski, Adam F. ^{[1
,11
]}

Lenc, Emil ^{[8
]}

Youngblood, Allison ^{[12
]}

Estes, Anna ^{[1
]}

Wilner, David J. ^{[13
]}

Forbrich, Jan ^{[13
,14
]}

Hughes, Anna ^{[15
]}

Law, Nicholas M. ^{[6
]}

Murphy, Tara ^{[7
]}

Boley, Aaron ^{[15
]}

Matthews, Jaymie ^{[15
]}

机构：

[1] Univ Colorado, Dept Astrophys & Planetary Sci, 2000 Colorado Ave, Boulder, CO 80309 USA

[2] Carnegie Inst Sci, Earth & Planets Lab, Washington, DC 20015 USA

[3] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

[4] NASA Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[5] Univ Maryland Baltimore Cty, Baltimore, MD 21250 USA

[6] Univ North Carolina Chapel Hill, Dept Phys & Astron, Chapel Hill, NC 27599 USA

[7] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia

[8] CSIRO Astron & Space Sci, Epping, NSW 1710, Australia

[9] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[10] Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA

[11] Univ Colorado Boulder, Natl Solar Observ, Boulder, CO 80303 USA

[12] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA

[13] Harvard & Smithsonian, Ctr Astrophysics|, Cambridge, MA 02138 USA

[14] Univ Hertfordshire, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England

[15] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2021年 / 911卷 / 02期

基金：

美国国家科学基金会;

关键词：

EARTH-LIKE PLANET; M STARS; CHEMISTRY; EVOLUTION; PACKAGE; EVENT; IV;

D O I：

10.3847/2041-8213/abf14c

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the discovery of an extreme flaring event from Proxima Cen by the Australian Square Kilometre Array Pathfinder (ASKAP), Atacama Large Millimeter/submillimeter Array (ALMA), Hubble Space Telescope (HST), Transiting Exoplanet Survey Satellite (TESS), and the du Pont Telescope that occurred on 2019 May 1. In the millimeter and FUV, this flare is the brightest ever detected, brightening by a factor of >1000 and >14,000 as seen by ALMA and HST, respectively. The millimeter and FUV continuum emission trace each other closely during the flare, suggesting that millimeter emission could serve as a proxy for FUV emission from stellar flares and become a powerful new tool to constrain the high-energy radiation environment of exoplanets. Surprisingly, optical emission associated with the event peaks at a much lower level with a time delay. The initial burst has an extremely short duration, lasting for <10 s. Taken together with the growing sample of millimeter M dwarf flares, this event suggests that millimeter emission is actually common during stellar flares and often originates from short burst-like events.

引用

页数：9