Search Publications
X-Ray Emission from the Exoplanet Hosting LTT 1445 Triple Star System
Brown, Alexander; France, Kevin; Youngblood, Allison +5 more
JWST will be able to observe the atmospheres of rocky planets transiting nearby M dwarfs. The M-dwarf triple star system LTT 1445, at a distance of 6.86 pc, hosts some of the nearest rocky terrestrial planets. These planets most likely orbit the M 3.5V star LTT 1445A. During a 28.6 ks Chandra ACIS-S3 observation we have: (i) spatially resolved and…
Modelling reconstruction and boulder size-frequency distribution of a young (<5 Myr) landslide located in Simud Vallis floor, Mars
Lucchetti, Alice; Pajola, Maurizio; Cremonese, Gabriele +8 more
We focus on a young (~ 4.5 Ma), 3.4 km long landslide located in the floor of Simud Vallis, Oxia Palus Quadrangle of Mars. By making use of a 2 m-scale HiRISE DEM we reconstruct the terrain surface before the landslide and in doing so we estimate the release and deposition heights and volumes related to the different stages of the landslide. Using…
On the Global Kinematic Positioning Variations During the September 2017 Solar Flare Events
Nie, Wenfeng; Rovira-Garcia, Adria; Wang, Yong +3 more
Several X-class solar flares (SFs) with different intensities and locations on the solar disk occurred in September 2017. Among them, the X9.3 SF on 6 September 2017 was the most intensive SF in the 24th solar cycle. In this study, we investigated and compared the ionospheric response to the different X-class SFs and their impacts on the Global Po…
Meta-analysis of Photometric and Asteroseismic Measurements of Stellar Rotation Periods: The Lomb–Scargle Periodogram, Autocorrelation Function, and Wavelet and Rotational Splitting Analysis for 92 Kepler Asteroseismic Targets
Suto, Yasushi; Benomar, Othman; Lu, Yuting +1 more
We perform intensity variability analyses (photometric analyses: the Lomb–Scargle periodogram, autocorrelation, and wavelet) and asteroseismic analysis of 92 Kepler solar-like main-sequence stars to understand the reliability of the measured stellar rotation periods. We focus on the 70 stars without reported stellar companions, and classify them i…
An extended scattered light disk around AT Pyx. Possible planet formation in a cometary globule
Schmidt, T. O. B.; Henning, T.; Ginski, C. +35 more
Aims: To understand how the multitude of planetary systems that have been discovered come to be, we need to study systems at different evolutionary stages, with different central stars but also in different environments. The most challenging environment for planet formation may be the harsh UV radiation field of nearby massive stars which qui…
The VMC survey - XLIX. Discovery of a population of quasars dominated by nuclear dust emission behind the Magellanic Clouds
Maitra, Chandreyee; Hopkins, Andrew M.; Haberl, Frank +14 more
Following the discovery of SAGE0536AGN (z ~ 0.14), with the strongest 10-µm silicate emission ever observed for an active galactic nucleus (AGN), we discovered SAGE0534AGN (z ~ 1.01), a similar AGN but with less extreme silicate emission. Both were originally mistaken as evolved stars in the Magellanic Clouds. Lack of far-infrared emission, …
Absorption Line Search through Three Local Group Dwarf Galaxy Halos
Bregman, Joel N.; Qu, Zhijie
Dwarf galaxies are missing nearly all of their baryons and metals from the stellar disk, which are presumed to be in a bound halo or expelled beyond the virial radius. The virial temperature for galaxies with M h ~ 109-1010 M ⊙ is similar to the collisional ionization equilibrium temperature for the C IV…
The volcanology of Idunn Mons, Venus: The complex evolution of a possible active volcano
Komatsu, Goro; López, Iván; D'Incecco, Piero +1 more
Idunn Mons is a shield volcano located in the Imdr Regio large igneous rise, a Venusian equivalent to a hotspot geologic province on Earth. Recent studies using emissivity data from ESA's Venus Express Mission, together with experimental laboratory studies on the alteration of volcanic materials on Venus conditions, suggest that Idunn Mons is a po…
SRG/eROSITA view of X-ray reflection in the Central Molecular Zone: a snapshot in September-October 2019
Khabibullin, Ildar; Churazov, Eugene; Sunyaev, Rashid
X-ray reflection off dense molecular clouds in the Galactic Centre region has established itself as a powerful probe for the past activity record of the supermassive black hole Sgr A* on a time-scale of a few hundred years. Detailed studies of the reflection signal from individual clouds allow us to estimate parameters of the brightest flare(s) an…
A Massive, Dusty, HI Absorption-Selected Galaxy at z ≈ 2.46 Identified in a CO Emission Survey
Walter, F.; Prochaska, J. X.; Revalski, M. +4 more
We report a NOrthern Extended Millimeter Array (NOEMA) and Atacama Large Millimeter/submillimeter Array search for redshifted CO emission from the galaxies associated with seven high-metallicity ([M/H] ≥ -1.03) damped Lyα absorbers (DLAs) at z ≈ 1.64-2.51. Our observations yielded one new detection of CO(3-2) emission from a galaxy at z = 2.4604 u…