author={David P. Huenemoerder and Norbert S. Schulz and Paola Testa and Jeremy J. Drake and Rachel A. Osten and Fabio Reale},
  journal={The Astrophysical Journal},
We study the spectral and temporal behavior of X-ray flares from the active M dwarf EV Lac in 200 ks of exposure with the Chandra/HETGS. We derive flare parameters by fitting an empirical function which characterizes the amplitude, shape, and scale. The flares range from very short (<1 ks) to long ({approx}10{sup 4} s) duration events with a range of shapes and amplitudes for all durations. We extract spectra for composite flares to study their mean evolution and to compare flares of different… Expand
Detection of Flare-associated CME Candidates on Two M-dwarfs by GWAC and Fast, Time-resolved Spectroscopic Follow-ups
The flare-associated stellar coronal mass ejections (CMEs) of solar-like and late-type stars profoundly impact the habitability of any expolanets in the systems. In this paper, we report theExpand
The Coronal Temperatures of Low-Mass Main-Sequence Stars
Aims. We study the X-ray emission of low-mass main-sequence stars to derive a reliable general scaling law between coronal temperature and the level of X-ray activity. Methods. We collect ROSATExpand
Stellar flares and the dark energy of CMEs
Abstract Flares we observe on stars in white light, UV or soft X-rays are probably harbingers of coronal mass ejections (CMEs). If we use the Sun as a guide, large stellar flares will dissipate twoExpand
A 33 yr constancy of the X-ray coronae of AR Lac and eclipse diagnosis of scale height
Extensive X-ray and EUV photometric observations of the eclipsing RS CVn system AR Lac were obtained over the years 1997-2013 with the Chandra X-Ray Observatory Extreme-Ultraviolet Explorer (EUVE).Expand
Properties of M Dwarf Flares at Millimeter Wavelengths
We report on two millimeter flares detected by ALMA at 220 GHz from AU Mic, a nearby M dwarf. The larger flare had a duration of only $\sim35$ sec, with peak $L_{R}=2\times10^{15}$ erg s$^{-1}$Expand
Suppression of Coronal Mass Ejections in Active Stars by an Overlying Large-scale Magnetic Field: A Numerical Study
We present results from a set of numerical simulations aimed at exploring the mechanism of coronal mass ejection (CME) suppression in active stars by an overlying large-scale magnetic field. We use aExpand
The Stellar CME–Flare Relation: What Do Historic Observations Reveal?
NASA Living [NNX16AC11G]; NASA [NAS8-03060]; NASA Astrobiology Institute [NNX15AE05G]; Chandra [AR4-15000X, GO5-16021X]; SI Grand Challenges grant "Lessons from Mars: Are Habitable Atmospheres onExpand
Understanding extreme quasar optical variability with CRTS – I. Major AGN flares
NSF [AST-1413600, AST-1518308]; Alfred P. Sloan Foundation; National Science Foundation; U.S. Department of Energy Office of Science; NASA
(Simulating) Coronal Mass Ejections in Active Stars
Abstract The stellar magnetic field completely dominates the environment around late-type stars. It is responsible for driving the coronal high-energy radiation (e.g. EUV/X-rays), the development ofExpand


Bright X-Ray Flares in Orion Young Stars from COUP: Evidence for Star-Disk Magnetic Fields?
We have analyzed a number of intense X-ray flares observed in the Chandra Orion Ultradeep Project (COUP), a 13 day observation of the Orion Nebula Cluster (ONC), concentrating on the events with theExpand
Detailed Diagnostics of an X-Ray Flare in the Single Giant HR 9024
We analyze a 96 ks Chandra HETGS observation of the single G-type giant HR 9024. The high flux allows us to examine spectral line and continuum diagnostics at high temporal resolution, to deriveExpand
From Radio to X-Ray: Flares on the dMe Flare Star EV Lacertae
We present the results of a campaign to observe flares on the M dwarf flare star EV Lacertae over the course of two days in 2001 September, utilizing a combination of radio continuum, opticalExpand
Diagnostics of stellar flares from X-ray observations: from the decay to the rise phase
Context. The diagnostics of stellar flaring coronal loops have been so far largely based on the analysis of the decay phase. Aims. We derive new diagnostics from the analysis of the rise and peakExpand
Modeling an X-ray flare on Proxima Centauri: Evidence of two flaring loop components and of two heating mechanisms at work
We model in detail a flare observed on Proxima Centauri with the EPIC-PN on board XMM-Newton at high statistics and high time resolution and coverage. Time-dependent hydrodynamic loop modeling isExpand
XMM-Newton X-ray spectroscopy of classical T Tauri stars
We present results from a comparative study of XMM-Newton observations of four classical T Tauri stars (CTTS), namely BP Tau, CR Cha, SU Aur and TW Hya. In these objects coronal, i.e. magnetic,Expand
X-ray properties of active M dwarfs as observed by XMM-Newton
We present a comparative study of X-ray emission from a sample of active M dwarfs with spectral types M3.5-M4.5 using XMM-Newton observations of two single stars, AD Leonis and EV Lacertae, and twoExpand
XMM-Newton and the Pleiades – I. Bright coronal sources and the X-ray emission from intermediate-type stars
We present results of X-ray spectral and timing analyses of solar-like (spectral types F5-K8) and intermediate-type (B4-F4) Pleiads observed in a 40-ks XMM-Newton EPIC exposure, probing X-rayExpand
XMM-Newton observation of the young open cluster Blanco 1. II. X-ray time variability and flares
We study the X-ray variability of the young open cluster Blanco 1 observed with the EPIC camera on board the XMM-Newton X-ray observatory. The time coverage of EPIC observations has allowed us toExpand
Modeling non-confined coronal flares: Dynamics and X-ray diagnostics
Long-lasting, intense, stellar X–ray flares may approach conditions of breaking magnetic confinement and evolving in open space. In the perspective of searching for possible tracers ofExpand