Search Publications
White-dwarf asteroseismology with the TESS space telescope
Córsico, A. H.
As white-dwarf (WD) stars cool, they go through one or more stages of g(gravity)-mode pulsational instability, becoming multiperiodic variable stars. Stars passing through these instability domains allow astronomers to study their interiors through asteroseismological techniques, as if they could ``look'' at their interiors by analyzing the spectr…
First detection of AlF line emission towards M-type AGB stars
Fonfría, J. P.; Velilla-Prieto, L.; Wedemeyer, S. +3 more
The nucleosynthesis production of fluorine (F) is still a matter of debate. Asymptotic giant branch (AGB) stars are one of the main candidates for F production. However, their contribution to the total F budget is not fully known due to the lack of observations. In this paper, we report the detection of aluminium monofluoride (AlF) line emission, …
Fundamental Properties of Late-Type Stars in Eclipsing Binaries
Ribas, Ignasi; Giménez, Álvaro; Morales, Juan Carlos +1 more
Evidence from the analysis of eclipsing binary systems revealed that late-type stars are larger and cooler than predicted by models, and that this is probably caused by stellar magnetic activity. In this work, we revisit this problem taking into account the advancements in the last decade. We provide and updated a list of 32 eclipsing binary or mu…
Flaring-associated Complex Dynamics in Two M Dwarfs Revealed by Fast, Time-resolved Spectroscopy
Wang, J.; Li, H. L.; Xin, L. P. +11 more
Habitability of an exoplanet is believed to be profoundly affected by activities of the host stars, although the related coronal mass ejections (CMEs) are still rarely detected in solar-like and late-type stars. We here report an observational study on the flares of two M dwarfs triggered by the high-cadence survey performed by the Ground-based Wi…
The Paschen Jump as a Diagnostic of the Diffuse Nebular Continuum Emission in Active Galactic Nuclei
Ho, Luis C.; Brandt, William N.; Barth, Aaron J. +17 more
Photoionization modeling of active galactic nuclei (AGN) predicts that diffuse continuum (DC) emission from the broad-line region makes a substantial contribution to the total continuum emission from ultraviolet through near-infrared wavelengths. Evidence for this DC component is present in the strong Balmer jump feature in AGN spectra, and possib…
A Submillimeter Survey of Faint Galaxies behind 10 Strong Lensing Clusters
Bauer, F. E.; Barger, A. J.; Cowie, L. L. +5 more
We present deep SCUBA-2 450 µm and 850 µm imaging of 10 strong lensing clusters. We provide a >4σ SCUBA-2 850 µm catalog of the 404 sources lying within a radius of $4\buildrel{\,\prime}\over{.} 5$ from the cluster centers. We also provide catalogs of the >4.5σ Atacama Large Millimeter/submillimeter Array (ALMA) 850 µ…
Viewing Angle Observations and Effects of Evolution with Redshift, Black Hole Mass, and Eddington Ratio in Quasar-based Cosmology
Pollo, Agnieszka; Czerny, Bożena; Prince, Raj +2 more
This study is focused on the observational measurement of the viewing angle of individual quasars by modeling the broadband quasar spectrum ranging from the IR to soft X-ray band. Sources are selected from various published catalogs, and their broadband quasi-simultaneous spectral data points were collected and used for modeling. We started with a…
Water observed in the atmosphere of τ Boötis Ab with CARMENES/CAHA
Zhang, Yapeng; Gandhi, Siddharth; Brogi, Matteo +4 more
Characterizing the atmospheres of hot Jupiters is important in understanding the formation and migration of these exotic planets. However, there are still many open questions about the chemical and physical properties of these atmospheres. Here, we confirm the detection of water vapour in thermal emission from the non-transiting hot Jupiter τ Boöt…
Carbon Dioxide Ice Glaciers at the South Pole of Mars
Smith, I. B.; Putzig, N. E.; Schlegel, N. -J. +4 more
Massive, kilometer thick deposits of carbon dioxide (CO2) ice have been detected at the south polar cap of Mars by radar investigations. These deposits are divided into several units that are separated by thin water ice bounding layers. Recent studies investigated the accumulation history of CO2 ice and found that the deposit…
TESS Observations of Kepler Systems with Transit Timing Variations
Dalba, Paul A.; Livingston, John H.; Jontof-Hutter, Daniel
We identify targets in the Kepler field that may be characterized by transit timing variations and are detectable by the Transiting Exoplanet Survey Satellite (TESS). Despite the reduced signal-to-noise ratio of TESS transits compared to Kepler, we recover 48 transits from 13 systems in Sectors 14, 15, 26, 40 and 41. We find strong evidence of a n…