Search Publications
Reconstructing paleolakes in Nepenthes Mensae, Mars, using the distribution of putative deltas, coastal-like features, and terrestrial analogs
García-Arnay, Ángel; Gutiérrez, Francisco
Nepenthes Mensae is an equatorial region situated north of the Martian dichotomy, northwest of Gale crater. It is characterized by a NW-SE-oriented belt of interconnected depressions, Late Noachian to Early Hesperian in age, with knobby terrains with residual relief. The highlands south of Nepenthes Mensae, Middle Noachian in age, correspond to th…
A kinematically unbiased, all-sky search for nearby, young, low-mass stars
Murphy, Simon J.; Kastner, Joel H.; Principe, David A. +6 more
The past two decades have seen dramatic progress in our knowledge of the population of young stars of age < 200 Myr that lie within 150 pc of the Sun. These nearby, young stars, most of which are found in loose, comoving groups, provide the opportunity to explore (among many other things) the dissolution of stellar clusters and their diffusion …
Forward modeling of galaxy kinematics in slitless spectroscopy
Copin, Y.; Outini, M.
Context. Slitless spectroscopy has long been considered a complicated and confused technique. Nonetheless, with the advent of Hubble Space Telescope (HST) instruments, characterized by a low sky background level and a high spatial resolution (most notably WFC3), slitless spectroscopy has become an adopted survey tool to study galaxy evolution from…
On the Reliability of Photometric and Spectroscopic Tracers of Halo Relaxation
Gozaliasl, Ghassem; Zhoolideh Haghighi, Mohammad H.; Raouf, Mojtaba +2 more
We characterize the relaxation state of galaxy systems by providing an assessment of the reliability of the photometric and spectroscopic probe via the semianalytic galaxy evolution model. We quantify the correlations between the dynamical age of simuglated galaxy groups and popular proxies of halo relaxation in observation, which are mainly eithe…
Applying the Dual-Spacecraft Approach to the Swarm Constellation for Deriving Radial Current Density
Lühr, Hermann; Ritter, Patricia; Kervalishvili, Guram +1 more
One of the Swarm prime mission goals is the estimation of ionospheric currents. Of particular interest in this context are field-aligned currents (FACs). In order to improve our ability of determining FACs, two of the Swarm spacecraft are orbiting side-by-side separated only by 1.4° in longitude. This close-formation flight enables the application…
Space Weather Monitor at the L5 Point: A Case Study of a CME Observed with STEREO B
Mierla, M.; Zhukov, A. N.; Rodriguez, L. +2 more
An important location for future space weather monitoring is the Lagrange point 5 (L5) of the Sun-Earth system. We test the performance of L5 for space weather monitoring using STEREO B observations of an Earth-directed coronal mass ejection (CME), seen as a partial halo by SOHO at L1. STEREO B (located close to L5) continuously tracked the CME. B…
Two Transiting Hot Jupiters from the WASP Survey: WASP-150b and WASP-176b
Henning, Thomas; Queloz, D.; Smalley, Barry +49 more
We report the discovery of two transiting exoplanets from the WASP survey, WASP-150b and WASP-176b. WASP-150b is an eccentric (e = 0.38) hot Jupiter on a 5.6 day orbit around a V = 12.03, F8 main-sequence host. The host star has a mass and radius of 1.4 ${M}_{\odot }$ and 1.7 ${R}_{\odot }$ respectively. WASP-150b has a mass and radius of 8.5 ${M}…
OGLE-GAL-ACEP-091: The First Known Multi-mode Anomalous Cepheid
Soszyński, I.; Smolec, R.; Udalski, A. +12 more
Anomalous Cepheids (ACs) are metal-deficient, core-helium-burning pulsating stars with masses in the range 1.2-2.2 ${M}_{\odot }$ . Until recently, all known ACs were pure single-mode pulsators. The first candidate for an AC pulsating in more than one radial mode—OGLE-GAL-ACEP-091—was recently identified in the Milky Way based on the photometric d…
Revealing the Spectroscopic Variations of FU Orionis Object V960 Mon with High-resolution Spectroscopy
Honda, Satoshi; Itoh, Yoichi; Takagi, Yuhei +3 more
We present the results of the high-resolution spectroscopy of the FU Orionis-type star V960 Mon. The brightness of V960 Mon decreased continuously after the outburst was detected in 2014 November. During this dimming event, we carried out medium-resolution spectroscopic monitoring observations and found that the equivalent width of the absorption …
Polycyclic aromatic hydrocarbon excitation in nearby spiral galaxies
Bendo, G. J.; Lu, N.; Zijlstra, A.
We have examined polycyclic aromatic hydrocarbon (PAH) excitation in a sample of 25 nearby face-on spiral galaxies using the ratio of mid-infrared PAH emission to dust mass. Within 11 of the galaxies, we found that the PAH excitation was straightforwardly linked to ultraviolet (UV) or mid-infrared star formation tracers, which, along with other re…