459 citations · 2.5k across the 50 of their papers we have counts for
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A recurrent 70-100 minute quasi-periodic pulsation in the intermediate-aged mid-M dwarf GJ 3512
J. López-Santiago, F. Reale, G. Micela +3
We report the discovery of a {recurrent} quasi-periodic pulsation (QPP) in the late-M dwarf GJ 3512 (M5.5V) using multiple TESS datasets. A strong signal with a period of 70-100 mi…
Simultaneous Kepler/K2 and XMM-Netwon observations of superflares in the Pleiades
M. G. Guarcello, G. Micela, S. Sciortino +10
Flares are powerful events ignited by a sudden release of magnetic energy. With the aim of studying flares in the 125-Myr-old stars in the Pleiades observed simultaneously in optic…
X-ray flare oscillations track plasma sloshing along star-disk magnetic tubes in Orion star-forming region
Fabio Reale, Javier Lopez-Santiago, Ettore Flaccomio +2
Pulsing X-ray emission tracks the plasma echo traveling in an extremely long magnetic tube that flares in an Orion Pre-Main Sequence (PMS) star. On the Sun, flares last from minute…
Star-disk interaction in classical T Tauri stars revealed using wavelet analysis
J. Lopez-Santiago, I. Crespo-Chacon, E. Flaccomio +3
The extension of the corona of classical T Tauri stars (CTTS) is under discussion. The standard model of magnetic configuration of CTTS predicts that coronal magnetic flux tubes co…
X-ray emission from stellar jets by collision against high-density molecular clouds: an application to HH 248
Javier Lopez-Santiago, Rosaria Bonito, Mariana Orellana +6
We investigate the plausibility of detecting X-ray emission from a stellar jet that impacts against a dense molecular cloud. This scenario may be usual for classical T Tauri stars…
The Gaia-ESO Survey: Chromospheric Emission, Accretion Properties, and Rotation in Velorum and Chamaeleon I
A. Frasca, K. Biazzo, A. C. Lanzafame +33
We use the fundamental parameters delivered by the GES consortium in the first internal data release to select the members of Vel and Cha I among the UVES and GIRAFFE spectrosc…
A GALEX based search for the sparse young stellar population in the Taurus-Aurigae star forming region
Ana I. Gomez de Castro, Javier López-Santiago, Fátima López-Martínez +5
In this work, we identify 63 bona fide new candidates to T Tauri stars (TTSs) in the Taurus-Auriga region using as baseline its ultraviolet excess. The initial data set has been de…
Young Stellar Object candidates toward the Orion region selected from GALEX
Nestor Sanchez, Ana Ines Gomez de Castro, Fatima Lopez-Martinez +1
We analyze 359 ultraviolet tiles from the All Sky Imaging Survey of the space mission GALEX covering roughly 400 square degrees toward the Orion star-forming region. There is a tot…
The corona of HD 189733 and its X-ray activity
I. Pillitteri, S. J. Wolk, J. Lopez-Santiago +5
Abridged. Here we report on the X-ray activity of the primary star, HD189733 A, using a new XMM-Newton observation and a comparison with the previous X-ray observations. The spectr…
The UV and X-ray activity of the M dwarfs within 10pc of the Sun
B. Stelzer, A. Marino, G. Micela +2
We systematically study the X-ray and ultraviolet emission of a subsample of M dwarfs from a recent proper-motion survey, selecting all M dwarfs within 10pc to obtain a nearly volu…
XMM-Newton monitoring of the close pre-main-sequence binary AK Sco. Evidence of tide driven filling of the inner gap in the circumbinary disk
Ana I. Gomez de Castro, Javier Lopez-Santiago, Antonio Talavera +2
AK~Sco stands out among pre-main sequence binaries because of its prominent ultraviolet excess, the high eccentricity of its orbit and the strong tides driven by it. AK Sco consist…
A comprehensive study of NGC 2023 with XMM-Newton and Spitzer
M. A. López-García, J. López-Santiago, J. F. Albacete-Colombo +2
Nearby star-forming regions are ideal laboratories to study high-energy emission of different stellar populations, from very massive stars to brown dwarfs. NGC 2023 is a reflection…
Evidence of accretion triggered oscillations in the pre-main-sequence interacting binary AK Sco
Ana I Gomez de Castro, Javier Lopez-Santiago, Antonio Talavera
Pre-main sequence (PMS) binaries are surrounded by circumbinary disks from which matter falls onto both components. The material dragged from the circumbinary disk flows onto each…
TYC 8380-1953-1: Discovery of an RS CVn binary through the XMM-Newton slew survey
J. Lopez-Santiago, B. Stelzer, R. Saxton
In this paper we report the discovery of the chromospherically active (RS CVn type) binary TYC 8380-1953-1 through the XMM-Newton slew survey and present results of our optical and…
The ultracool dwarf DENIS-P J104814.7-395606. Chromospheres and coronae at the low-mass end of the main-sequence
B. Stelzer, J. Alcala, K. Biazzo +8
We have obtained an XMM-Newton observation and a broad-band spectrum from the ultraviolet to the near infrared with X-Shooter for one of the nearest M9 dwarfs, DENIS-P J1048-3956 (…
The effect of magnetic activity saturation in chromospheric flux-flux relationships
R. M. Martínez-Arnáiz, J. López-Santiago, I. Crespo-Chacón +1
We present a homogeneous study of chromospheric and coronal flux-flux relationships using a sample of 298 late-type dwarf active stars with spectral types F to M. The chromospheric…
Deep XMM-Newton observation of the Eta Chamaleontis cluster
J. Lopez-Santiago, J. F. Albacete Colombo, M. A. Lopez-Garcia
The members of the Eta Chamaleontis cluster are in an evolutionary stage in which disks are rapidly evolving. It also presents some peculiarities, such as the large fraction of bin…
HRC-I/Chandra X-ray observations towards sigma Orionis
J. A. Caballero, J. F. Albacete-Colombo, J. Lopez-Santiago
Aims: We investigated the X-ray emission from young stars and brown dwarfs in the sigma Orionis cluster (tau~3 Ma, d~385 pc) and its relation to mass, presence of circumstellar dis…
A high-resolution spectroscopic survey of late-type stars: chromospheric activity, rotation, kinematics, and age
J. Lopez-Santiago, D. Montes, M. C. Galvez-Ortiz +5
Aims: We present a compilation of spectroscopic data from a survey of 144 chromospherically active young stars in the solar neighborhood which may be used to investigate different…
Quantifying the contamination by old main-sequence stars in young moving groups: the case of the Local Association
J. Lopez-Santiago, G. Micela, D. Montes
The associations and moving groups of young stars are excellent laboratories for investigating stellar formation in the solar neighborhood. Previous results have confirmed that a n…
X-ray variability of sigma Orionis young stars with ROSAT
J. A. Caballero, J. Lopez-Santiago, E. de Castro +1
We used the Aladin Virtual Obsrvatory tool and High Resolution Imager ROSAT archival data to search for X-ray variability in scale of days in 23 young stars in the sigma Orionis cl…