Search Publications
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…
Nitrogen fractionation towards a pre-stellar core traces isotope-selective photodissociation
Caselli, P.; Spezzano, S.; Sipilä, O. +1 more
Context. Isotopologue abundance ratios are important to understand the evolution of astrophysical objects and ultimately the origins of a planetary system such as our own. With nitrogen being a fundamental ingredient of pre-biotic material, understanding its chemistry and inheritance is of fundamental importance to understand the formation of the …
The JCMT BISTRO Survey: multiwavelength polarimetry of bright regions in NGC 2071 in the far-infrared/submillimetre range, with POL-2 and HAWC+
Pattle, Kate; Ward-Thompson, Derek; Berry, David +31 more
Polarized dust emission is a key tracer in the study of interstellar medium and of star formation. The observed polarization, however, is a product of magnetic field structure, dust grain properties, and grain alignment efficiency, as well as their variations in the line of sight, making it difficult to interpret polarization unambiguously. The co…
Candidate high-redshift protoclusters and lensed galaxies in the Planck list of high-z sources overlapping with Herschel-SPIRE imaging
Hill, Ryley; Scott, Douglas; Dole, Hervé +3 more
The Planck list of high-redshift source candidates (the PHz catalogue) contains 2151 peaks in the cosmic infrared background, unresolved by Planck's 5 arcmin beam. Follow-up spectroscopic observations have revealed that some of these objects are $z\, {\approx }\, 2$ protoclusters and strong gravitational lenses but an unbiased survey has not yet b…