Search Publications
Discovery of Bright Galactic R Coronae Borealis and DY Persei Variables: Rare Gems Mined from ACVS
Cenko, S. B.; Bloom, J. S.; Stassun, K. G. +4 more
We present the results of a machine-learning (ML)-based search for new R Coronae Borealis (RCB) stars and DY Persei-like stars (DYPers) in the Galaxy using cataloged light curves from the All-Sky Automated Survey (ASAS) Catalog of Variable Stars (ACVS). RCB stars—a rare class of hydrogen-deficient carbon-rich supergiants—are of great interest owin…
Solar-Storm/Lunar Atmosphere Model (SSLAM): An overview of the effort and description of the driving storm environment
Delory, G. T.; Halekas, J. S.; Farrell, W. M. +9 more
On 29 April 1998, a coronal mass ejection (CME) was emitted from the Sun that had a significant impact at Earth. The terrestrial magnetosphere became more electrically active during the storm passage. Less explored is the effect of such a storm on an exposed rocky body like our Moon. The solar-storm/lunar atmosphere modeling effort (SSLAM) brings …
Star-galaxy separation in the AKARI NEP deep field
Pearson, C. P.; Ohyama, Y.; Takagi, T. +10 more
Context. It is crucial to develop a method for classifying objects detected in deep surveys at infrared wavelengths. We specifically need a method to separate galaxies from stars using only the infrared information to study the properties of galaxies, e.g., to estimate the angular correlation function, without introducing any additional bias.
…
Magnetic field measurements during the ROSETTA flyby at asteroid (21)Lutetia
Richter, I.; Glassmeier, K. H.; Carr, C. M. +5 more
On July 10, 2010, the ROSETTA spacecraft performed a flyby at asteroid (21)Lutetia at a solar distance of 2.72 AU. The spacecraft-asteroid distance at closest approach was 3120 km. The magnetometers onboard ROSETTA were operating but did not detect any conclusive signature of the asteroid. Any magnetic field signature which could possibly be attri…
AKARI Observation of the North Ecliptic Pole (NEP) Supercluster at z = 0.087: Mid-infrared View of Transition Galaxies
Kim, Seong Jin; Papovich, Casey; Weiner, Benjamin J. +12 more
We present the mid-infrared (MIR) properties of galaxies within a supercluster in the north ecliptic pole region at z ~ 0.087 observed with the AKARI satellite. We use data from the AKARI NEP-Wide (5.4 deg2) IR survey and the CLusters of galaxies EVoLution studies (CLEVL) mission program. We show that near-IR (3 µm)-mid-IR (11 &mi…
Water in star- and planet-forming regions
van Dishoeck, E. F.; Bergin, E. A.
In this paper we discuss the astronomical search for water vapor in order to understand the disposition of water in all its phases throughout the process of star and planet formation. Our ability to detect and study water vapor has recently received a tremendous boost with the successful launch and operations of the Herschel Space Observatory. Her…
The blue straggler star population in NGC 6229
Dalessandro, E.; Sanna, N.; Beccari, G. +3 more
We have used a combination of high-resolution Hubble Space Telescope Wide Field Planetary Camera 2 and wide-field ground-based observations in ultraviolet and optical bands to study the blue straggler star (BSS) population of the outer halo globular cluster NGC 6229 over its entire radial extent. A total of 64 bright BSS (with m255≤ 21.…
Three quasi-stellar objects acting as strong gravitational lenses
Djorgovski, S. G.; Stern, D.; Faure, C. +8 more
We report the discovery of three new cases of quasi-stellar objects (QSOs) acting as strong gravitational lenses on background emission line galaxies: SDSS J0827+5224 (zQSO = 0.293, zs = 0.412), SDSS J0919+2720 (zQSO = 0.209, zs = 0.558), SDSS J1005+4016 (zQSO = 0.230, zs = 0.441). …
Changes in the magnetotail configuration before near-Earth reconnection
Gordeev, E. I.; Snekvik, K.; Østgaard, N. +4 more
We have examined three typical substorm growth phase signatures in the magnetotail two hours before near Earth reconnection; namely current sheet thinning, field line stretching and increase in the lobe magnetic pressure. The reconnection events were identified from in situ measurements in the plasma sheet by the Cluster spacecraft. The events wer…
2M1155-79 (= T Chamaeleontis B): A Low-mass, Wide-separation Companion to the nearby, "Old" T Tauri Star T Chamaeleontis
Montez, Rodolfo; Murphy, Simon J.; Kastner, Joel H. +3 more
The early-K star T Cha, a member of the nearby (D ≈ 100 pc) epsilon Cha Association, is a relatively "old" (age ~ 7 Myr) T Tauri star that is still sporadically accreting from an orbiting disk whose inner regions are now evidently being cleared by a close, substellar companion. We report the identification, via analysis of proper motions, serendip…