Search Publications
A Wolf 359 in Sheep's Clothing: Hunting for Substellar Companions in the Fifth-closest System Using Combined High-contrast Imaging and Radial Velocity Analysis
Carter, Aarynn L.; Jensen-Clem, Rebecca; Salama, Maïssa +16 more
Wolf 359 (CN Leo, GJ 406, Gaia DR3 3864972938605115520) is a low-mass star in the fifth-closest neighboring system (2.41 pc). Because of its relative youth and proximity, Wolf 359 offers a unique opportunity to study substellar companions around M stars using infrared high-contrast imaging and radial velocity monitoring. We present the results of …
Discovery of TOI-1260d and the characterization of the multiplanet system
Guterman, P.; Alonso, R.; Deleuil, M. +84 more
We report the discovery of a third planet transiting the star TOI-1260, previously known to host two transiting sub-Neptune planets with orbital periods of 3.127 and 7.493 d, respectively. The nature of the third transiting planet with a 16.6-d orbit is supported by ground-based follow-up observations, including time-series photometry, high-angula…
Microwaving Mimas, Enceladus, Tethys, Dione, Rhea, Iapetus and Phoebe: Insights into the regolith properties and geological history of Saturn's icy satellites
Lellouch, Emmanuel; Wall, Stephen; Le Gall, Alice A. +4 more
While Saturn's main airless moons are all composed largely of water ice, their respective thermal histories and near environments have led to different regolith compositions and structures. Part of this history is recorded in their subsurface which can be probed by microwaves. Using a combined thermal and radiative transfer model, we here investig…
Outlier Detection in the DESI Bright Galaxy Survey
Melchior, Peter; Ward, Charlotte; Goulding, Andy +3 more
We present an unsupervised search for outliers in the Bright Galaxy Survey (BGS) data set from the DESI Early Data Release. This analysis utilizes an autoencoder to compress galaxy spectra into a compact, redshift-invariant latent space, and a normalizing flow to identify low-probability objects. The most prominent outliers show distinctive spectr…
Shocks and Photoionization of the Inner 650 au Jet of the Interacting Binary Star R Aquarii from Multiwavelength Hubble Space Telescope Observations
Montez, Rodolfo; Raymond, John C.; Karovska, Margarita +3 more
Astrophysical jets are present in a range of environments, including young stellar objects, X-ray binaries, and active galactic nuclei, but their formation is still not fully understood. As one of the nearest symbiotic binary stars, R Aquarii (D ~ 220 pc) offers a unique opportunity to study the inner region within ~600 au of the jet source, which…
Spectroscopic survey of faint planetary-nebula nuclei - II. The subdwarf O central star of Fr 2-30
Bond, Howard E.; Zeimann, Gregory R.; Werner, Klaus +1 more
Fr 2-30 = PN? G126.8-15.5 is a faint emission nebula, hosting a 14th-mag central star that we identify here for the first time. Deep Hα and [O III] images reveal a roughly elliptical nebula with dimensions of at least 22 arcmin × 14 arcmin, fading into a surrounding network of even fainter emission. Optical spectrograms of the central star show it…
Studying X-ray instruments with galaxy clusters
Molendi, S.; Nevalainen, J.
Aims: Our aim is to apply a scientific approach to the problem of the effective area cross-calibration of the XMM-Newton EPIC instruments. Using a sample of galaxy clusters observed with XMM-Newton EPIC, we aim to quantify the effective area cross-calibration bias between the EPIC instruments as implemented in the public calibration database …
A Dwarf Galaxy Debris Stream Associated with Palomar 1 and the Anticenter Stream
Tan, Ke-Feng; Zhao, Gang; Zhao, Jing-Kun +2 more
We report the discovery of a new stream (dubbed as Yangtze) detected in Gaia Data Release 3. The stream is at a heliocentric distance of ~9.12 kpc and spans nearly 27° by 1.°9 on the sky. The color-magnitude diagram of Yangtze indicates a stellar population of age ~11 Gyr and [M/H] ~ -0.7 dex. It has a number density of about 5.5 stars deg-2<…
Change detection and monitoring of active Martian surface phenomena with the Colour and Stereo Surface Imaging System (CaSSIS) onboard the ExoMars Trace Gas Orbiter (TGO)
Seelos, Frank P.; Tornabene, Livio L.; Osinski, Gordon R. +10 more
Mars is host to a variety of active surface processes that relate to changes in seasonal ice/frost, slope activity, wind and processes potentially relating to liquid water. Regular monitoring and change detection of these phenomena is crucial to not only provide us insights into present day Martian surface conditions, but also its past geologic an…
CHEX-MATE: A non-parametric deep learning technique to deproject and deconvolve galaxy cluster X-ray temperature profiles
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +21 more
Temperature profiles of the hot galaxy cluster intracluster medium (ICM) have a complex non-linear structure that traditional parametric modelling may fail to fully approximate. For this study, we made use of neural networks, for the first time, to construct a data-driven non-parametric model of ICM temperature profiles. A new deconvolution algori…