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A kinematic calibration of the O-rich Mira variable period-age relation from Gaia
Zhang, Hanyuan; Sanders, Jason L.
Empirical and theoretical studies have demonstrated that the periods of Mira variable stars are related to their ages. This, together with their brightness in the infrared, makes them powerful probes of the formation and evolution of highly-extincted or distant parts of the Local Group. Here we utilize the Gaia DR3 catalogue of long-period variabl…
An Unbiased CO Survey Toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. II. CO Cloud Catalog
Tokuda, Kazuki; Tachihara, Kengo; Kawamura, Akiko +16 more
The nature of molecular clouds and their statistical behavior in subsolar metallicity environments are not fully explored yet. We analyzed data from an unbiased CO (J = 2-1) survey at the spatial resolution of ~2 pc in the northern region of the Small Magellanic Cloud with the Atacama Compact Array to characterize the CO cloud properties. A cloud-…
Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host Stars
Haardt, Francesco; Rauscher, Emily; Gallo, Elena +4 more
We leverage Gaia DR2 parallactic distances to deliver new or revised estimates of planetary parameters and X-ray irradiation for a distance-limited (≲100 pc) sample of 27 gaseous planets (from super-Earths to hot Jupiters) with publicly available Chandra and/or XMM observations, for which we carry out a homogeneous data reduction. For 20 planets w…
New Metrics to Probe the Dynamical State of Galaxy Clusters
Natarajan, Priyamvada; Cappelluti, Nico; Cerini, Giulia
We present new diagnostic metrics to probe the dynamical state of galaxy clusters. These novel metrics rely on the computation of the power spectra of the matter and gas distributions and their cross-correlation derived from cluster observations. This analysis permits us to cross-correlate the fluctuations in the matter distribution, inferred from…
Constraining constant and tomographic coupled dark energy with low-redshift and high-redshift probes
Gómez-Valent, Adrià; Kilbinger, Martin; Pettorino, Valeria +1 more
We consider coupled dark energy (CDE) cosmologies, where dark matter particles feel a force stronger than gravity, due to the fifth force mediated by a scalar field which plays the role of dark energy. We perform for the first time a tomographic analysis of coupled dark energy, where the coupling strength is parametrized and constrained in differe…
Identifying Exoplanets with Deep Learning. V. Improved Light-curve Classification for TESS Full-frame Image Observations
Vanderburg, Andrew; Dattilo, Anne; Ricker, George R. +8 more
The TESS mission produces a large amount of time series data, only a small fraction of which contain detectable exoplanetary transit signals. Deep-learning techniques such as neural networks have proved effective at differentiating promising astrophysical eclipsing candidates from other phenomena such as stellar variability and systematic instrume…
High-resolution shape models of Phobos and Deimos from stereophotoclinometry
Barnouin, Olivier S.; Daly, R. Terik; Ernst, Carolyn M. +5 more
We created high-resolution shape models of Phobos and Deimos using stereophotoclinometry and united images from Viking Orbiter, Phobos 2, Mars Global Surveyor, Mars Express, and Mars Reconnaissance Orbiter into a single coregistered collection. The best-fit ellipsoid to the Phobos model has radii of (12.95 ± 0.04) km × (11.30 ± 0.04) km × (9.16 ± …
The Radial Distribution and Excitation of H2 around Young Stars in the HST-ULLYSES Survey
Herczeg, Gregory J.; France, Kevin; Ábrahám, P. +8 more
The spatial distribution and evolution of gas in the inner 10 au of protoplanetary disks form the basis for estimating the initial conditions of planet formation. Among the most important constraints derived from spectroscopic observations of the inner disk are the radial distributions of the major gas phase constituents, how the properties of the…
Extended corona models of X-ray reverberation in the AGN 1H 0707-495 and IRAS 13224-3809
Chainakun, P.; Young, A. J.; Hancock, S.
We fit a new vertically extended corona model to previously measured reverberation time lags observed by XMM-Newton in two extremely variable narrow-line Seyfert 1 active galactic nuclei, 1H 0707-495 and IRAS 13224-3809, in a variety of similarly observed flux groups and explore the model in all observations over a 16 yr period. The model employs …
A full transit of v2 Lupi d and the search for an exomoon in its Hill sphere with CHEOPS
Guterman, P.; Alonso, R.; Deleuil, M. +90 more
The planetary system around the naked-eye star v2 Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses (M⊕). The TESS and CHEOPS missions revealed that all three planets are transiting and have radii straddling the radius gap separating volatile-rich and volatile-poor super…