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H2O distribution in the disc of HD 100546 and HD 163296: the role of dust dynamics and planet-disc interaction
Lodato, G.; Fedele, D.; van Dishoeck, E. F. +3 more
Water plays a fundamental role in the formation of planets and their atmospheres. Far-infrared observations with the Herschel Space Observatory revealed a surprisingly low abundance of cold-water reservoirs in protoplanetary discs. On the other hand, a handful of discs show emission of hot water transitions excited at temperatures above a few hund…
An Adaptive Optics Census of Companions to Northern Stars Within 25 pc with Robo-AO
Baranec, Christoph; Law, Nicholas M.; Riddle, Reed +8 more
In order to assess the multiplicity statistics of stars across spectral types and populations in a volume-limited sample, we censused nearby stars for companions with Robo-AO. We report on observations of 1157 stars of all spectral types within 25 pc with decl. >-13° searching for tight companions. We detected 154 companion candidates with sepa…
Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid
Schultheis, M.; Minniti, D.; Valentini, M. +19 more
The central part of the Galaxy hosts a multitude of stellar populations, including the spheroidal bulge stars, stars moved to the bulge through secular evolution of the bar, inner halo, inner thick disc, inner thin disc, as well as debris from past accretion events. We identified a sample of 58 candidate stars belonging to the stellar population o…
How Do Spitzer IRAC Fluxes Compare to HST CALSPEC?
Gordon, Karl D.; Hubeny, Ivan; Bohlin, Ralph C. +1 more
An accurate tabulation of stellar brightness in physical units is essential for a multitude of scientific endeavors. The HST/CALSPEC database of flux standards contains many stars with spectral coverage in the 0.115-1 µm range, with some extensions to longer wavelengths of 1.7 or 2.5 µm. Modeled flux distributions to 32 µm for ca…
Multiwavelength Vertical Structure in the AU Mic Debris Disk: Characterizing the Collisional Cascade
MacGregor, Meredith A.; Hughes, A. Meredith; Wilner, David J. +9 more
Debris disks are scaled-up analogs of the Kuiper Belt in which dust is generated by collisions between planetesimals. In the collisional cascade model of debris disks, the dust lost to radiation pressure and winds is constantly replenished by grinding collisions between planetesimals. The model assumes that collisions are destructive and involve l…
Occultation portal: A web-based platform for data collection and analysis of stellar occultations
Souami, D.; Sicardy, B.; Gomes-Júnior, A. R. +9 more
Recording a stellar occultation is one powerful method that gives direct information about the physical properties of the occulting Solar system object. In order to obtain reliable and accurate results, simultaneous observations from different locations across-track of the projected path are of great importance. However, organizing all the observi…
Follow-up Observations of the Prolonged, Super-Eddington, Tidal Disruption Event Candidate 3XMM J150052.0+015452: the Slow Decline Continues
Ramirez-Ruiz, Enrico; Komossa, S.; Maksym, W. Peter +7 more
The X-ray source 3XMM J150052.0+015452 was discovered as a spectacular tidal disruption event candidate during a prolonged (>11 yr) outburst. It exhibited unique quasi-soft X-ray spectra of characteristic temperature kT ~ 0.3 keV for several years at the peak, but in a recent Chandra observation (10 yr into the outburst) a super-soft X-ray spec…
The Space Physics Environment Data Analysis System in Python
Miyoshi, Yoshizumi; Le Contel, Olivier; Matsuda, Shoya +13 more
In this article, we describe the free, open-source Python-based Space Physics Environment Data Analysis System (PySPEDAS), a platform for multi-mission, multi-instrument retrieval, analysis, and visualization of Heliophysics data. PySPEDAS currently contains load routines for data from 23 space missions, as well as a variety of data from ground-ba…
Testing Velocity Kinks as a Planet Detection Method: Do Velocity Kinks in Surface Gas Emission Trace Planetary Spiral Wakes in the Midplane Continuum?
Dong, Ruobing; Speedie, Jessica
Spiral density waves generated by an embedded planet are understood to cause "kinks" in observed velocity channel maps of CO surface emission by perturbing the gas motion within the spiral arms. If velocity kinks are a reliable probe of embedded planets, we should expect to see the planet-driven spiral arms in other observational tracers. We test …
A new method to measure the spectra of transiting exoplanet atmospheres using multi-object spectroscopy
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +5 more
Traditionally, ground-based spectrophotometric observations probing transiting exoplanet atmospheres have employed a linear map between comparison and target star light curves (e.g. via differential spectrophotometry) to correct for systematics contaminating the transit signal. As an alternative to this conventional method, we introduce a new Gaus…