Search Publications
Circum-Tharsis wrinkle ridges at Lunae Planum: Morphometry, formation, and crustal implications
Karagoz, Oguzcan; Kenkmann, Thomas; Wulf, Gerwin
Wrinkle ridges are one of the most widespread tectonic landforms on Mars developed under a compressional stress regime within the lithosphere. In this study, we investigate the morphology and structure of wrinkle ridges at northern Lunae Planum, which belongs to the circum-Tharsis wrinkle ridge system. We use methods to construct balanced cross-se…
Measuring the α-abundance of Subsolar-metallicity Stars in the Milky Way's Central Half-parsec: Testing Globular Cluster and Dwarf Galaxy Infall Scenarios
Bentley, Rory O.; Kerzendorf, Wolfgang; Do, Tuan +4 more
While the Milky Way nuclear star cluster (MW NSC) has been studied extensively, how it formed is uncertain. Studies have shown it contains a solar and supersolar metallicity population that may have formed in situ, along with a subsolar-metallicity population that may have formed via mergers of globular clusters and dwarf galaxies. Stellar abundan…
Constraining masses and separations of unseen companions to five accelerating nearby stars
Rouan, D.; Schmidt, T. O. B.; Henning, T. +40 more
Aims: In this work, we aim to constrain the masses and separations of potential substellar companions to five accelerating stars (HIP 1481, HIP 88399, HIP 96334, HIP 30314, and HIP 116063) using multiple data sets acquired with different techniques.
Methods: Our targets were originally observed as part of the SPHERE/SHINE survey, and rad…
Magnetic Helicity Evolution and Eruptive Activity in NOAA Active Region 11158
Pariat, E.; Green, L. M.; Valori, G. +3 more
Coronal mass ejections are among the Sun's most energetic activity events yet the physical mechanisms that lead to their occurrence are not yet fully understood. They can drive major space weather impacts at Earth, so knowing why and when these ejections will occur is required for accurate space weather forecasts. In this study we use a 4 day time…
A measurement of stellar surface gravity hidden in radial velocity differences of comoving stars
Slone, Oren; Cantiello, Matteo; Perets, Hagai B. +2 more
The gravitational redshift induced by stellar surface gravity is notoriously difficult to measure for non-degenerate stars, since its amplitude is small in comparison with the typical Doppler shift induced by stellar radial velocity. In this study, we make use of the large observational data set of the Gaia mission to achieve a significant reducti…
Hen 3-860: new southern eclipsing symbiotic star observed in the outburst
Merc, J.; Gális, R.; Wolf, M. +3 more
Brightening of Hen 3-860, previously classified as an Hα emitter, was detected by the All-Sky Automated Survey for Supernovae (ASAS-SN) survey at the end of the year 2016. We have obtained the first spectroscopic observations of the transient and supplemented them with photometric data from the Digital Access to a Sky Century at Harvard (DASCH) ar…
CHEMOUT: CHEMical complexity in star-forming regions of the OUTer Galaxy. II. Methanol formation at low metallicity
Elia, D.; Magrini, L.; Caselli, P. +8 more
Context. The outer Galaxy is an environment with a lower metallicity than the regions surrounding the Sun and for this reason the formation and survival of molecules in star-forming regions located in the inner and outer Galaxy are expected to be different.
Aims: To gain understanding of how chemistry changes throughout the Milky Way, it is c…
Disks and Outflows in the Intermediate-mass Star-forming Region NGC 2071 IR
Li, Zhi-Yun; Sheehan, Patrick D.; Megeath, S. Thomas +13 more
We present Atacama Large Millimeter Array band 6/7 (1.3 mm/0.87 mm) and Very Large Array Ka-band (9 mm) observations toward NGC 2071 IR, an intermediate-mass star-forming region. We characterize the continuum and associated molecular line emission toward the most luminous protostars, i.e., IRS1 and IRS3, on ~100 au (0.″2) scales. IRS1 is partly re…
Searching for young runaways across the sky
Stassun, Keivan G.; Kounkel, Marina; Leigh, Nathan +1 more
We present a catalogue of 3354 candidate young stars within 500 pc that appear to have been ejected from their parent associations with relative speeds of >5 km s-1. These candidates have been homogeneously selected through performing a 2D spherical traceback of previously identified pre-main-sequence candidates to various star-formi…
Kepler Pixel Project: Background RR Lyrae Stars in the Primary Kepler Mission Field of View
Bódi, Attila; Szabó, Róbert; Forró, Adrienn +1 more
In this paper, we describe a project we initiated to investigate individual pixels in downloaded Kepler apertures in order to find objects in the background of the main targets with variable brightness. In the first paper of this series, we discovered and investigated 547 short-period eclipsing binaries. Here we present the independent discovery o…