A dataset provided by the European Space Agency

Name: Where are the mid-sized flares of ultracool M dwarfs?
Published: 2016-05-08T22:00:00Z

Proposal ID	074185
Title	Where are the mid-sized flares of ultracool M dwarfs?
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0741850101
DOI	https://doi.org/10.5270/esa-04daize
Principal Investigator, PI	Dr Katja Poppenhaeger
Abstract	We propose to observe the M8.5 dwarf SCR J1845-6357 with XMM-Newton EPIC for 60ks. Very low-mass M dwarfs show a distinct drop in X-ray luminosity compared toslightly more massive M dwarfs. Surprisingly, this does not happen at the massthreshold where M dwarfs become fully convective (M4), but at significantlylower masses (M8). These very low mass stars seem to have a flaring behaviourdifferent from earlier type stars: they display either occasional large flaresor a very low-level flickering in their X-ray light curves, but not thecanonical power-law flare-energy distribution observed for the Sun and othercool stars. Our aim is to collect a long-duration light curve for one of themost nearby ultracool dwarfs to quantify how its flare-energy distribution differs from earlier type stars.
Publications	Classification of 4XMM-DR9 sources by machine learning \|Zhang Yanxia Zhao Yongheng \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez Antonio C. \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R Robust constraints on feebly interacting particles using XMM-Newton \|Luque Pedro De la Torre Balaji Shyam \| PhRvD \| 109-L101305 \| 2024 \| 2024PhRvD.109j1305L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j1305L Multimessenger search for electrophilic feebly interacting particles from supernovae \|Luque Pedro De la Torre Balaji Shyam \| PhRvD \| 109-103028 \| 2024 \| 2024PhRvD.109j3028L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j3028L Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 968-46 \| 2024 \| 2024ApJ...968...46D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...968...46D New 511 keV Line Data Provide Strongest sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 973-L6 \| 2024 \| 2024ApJ...973L...6D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...973L...6D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2015-04-13T16:37:41Z/2015-04-14T13:27:41Z
Version	17.56_20190403_1200
Mission Description	The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2016-05-08T22:00:00Z
Last Update	2026-03-04
Keywords	"EPIC", "M8", "duration light curve", "XMM-Newton", "low level", "lower masses m8", "type stars", "mass threshold", "xray light curves", "mid sized flare", "convective m4", "distinct drop", "nearby ultracool dwarfs", "cool stars", "dwarfs ?.", "low mass stars", "xmm newton epic", "XMM", "xray luminosity", "low mass"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Katja Poppenhaeger, 2016, 'Where are the mid-sized flares of ultracool M dwarfs?', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-04daize