Search Publications
A near-infrared variability survey of young planetary-mass objects
Henning, Thomas; Manjavacas, Elena; Schlieder, Joshua +12 more
We present a photometric variability survey of young planetary-mass objects using the New Technology Telescope in the JS and KS bands. Surface gravity plays an important role in the atmospheric structure of brown dwarfs, as young low-gravity L dwarfs have a higher variability rate than field L dwarfs. In this study, we extend…
The motivation for flexible star-formation histories from spatially resolved scales within galaxies
Tacchella, Sandro; Mosleh, Moein; Jain, Shweta
The estimation of galaxy stellar masses depends on the assumed prior of the star-formation history (SFH) and spatial scale of the analysis (spatially resolved versus integrated scales). In this paper, we connect the prescription of the SFH in the spectral energy distribution (SED) fitting to spatially resolved scales (~kpc) to shed light on the sy…
Evidence for non-zero turbulence in the protoplanetary disc around IM Lup
Hughes, A. Meredith; Wilner, David J.; Kóspál, Ágnes +6 more
The amount of turbulence in protoplanetary discs around young stars is critical for determining the efficiency, timeline, and outcomes of planet formation. It is also difficult to measure. Observations are still limited, but direct measurements of the non-thermal, turbulent gas motion are possible with the Atacama Large Millimeter/submillimeter Ar…
Introducing the Condor Array Telescope - IV. A possible nova super-remnant surrounding the putative recurrent nova KT Eridani
Walter, Frederick M.; Shara, Michael M.; Lanzetta, Kenneth M. +10 more
Just 10 recurrent novae (RNe) - which erupt repeatedly on time-scales shorter than one century - are known in our Galaxy. The most extreme RN known (located in the Andromeda galaxy), M31N 2008-12a, undergoes a nova eruption every year, and is surrounded by a vast nova 'super-remnant', 134 pc in extent. Simulations predict that all RNe should be su…
Stellar atmospheric parameters from Gaia BP/RP spectra using uncertain neural networks
Sanders, Jason L.; Fallows, Connor P.
With the plentiful information available in the Gaia BP/RP spectra, there is significant scope for applying discriminative models to extract stellar atmospheric parameters and abundances. We describe an approach to leverage an 'Uncertain Neural Network' model trained on APOGEE data to provide high-quality predictions with robust estimates for per-…
The LOFAR Two-metre Sky Survey: The nature of the faint source population and SFR-radio luminosity relation using PROSPECTOR
Drake, Alyssa B.; Małek, Katarzyna; Morabito, Leah K. +12 more
Spectral energy distribution (SED) fitting has been extensively used to determine the nature of the faint radio source population. Recent efforts have combined fits from multiple SED-fitting codes to account for the host galaxy and any active nucleus that may be present. We show that it is possible to produce similar-quality classifications using …
Cosmic star-formation history and black hole accretion history inferred from the JWST mid-infrared source counts
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +7 more
With the advent of the JWST, extragalactic source count studies were conducted down to sub-µJy in the mid-infrared (MIR), which is several tens of times fainter than what the previous-generation infrared (IR) telescopes achieved in the MIR. In this work, we aim to interpret the JWST source counts and constrain cosmic star-formation history (…
A new derivation of the Hubble constant from γ-ray attenuation using improved optical depths for the Fermi and CTA era
Ajello, M.; Saldana-Lopez, A.; Pérez-González, P. G. +8 more
We present γ-ray optical-depth calculations from a recently published extragalactic background light (EBL) model built from multiwavelength galaxy data from the Hubble Space Telescope Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey (HST/CANDELS). CANDELS gathers one of the deepest and most complete observations of stellar and dust e…
Red supergiant candidates for multimessenger monitoring of the next Galactic supernova
Milisavljevic, Dan; Tanaka, Masaomi; Weil, Kathryn +6 more
We compile a catalogue of 578 highly probable and 62 likely red supergiants (RSGs) of the Milky Way, which represents the largest list of Galactic RSG candidates designed for continuous follow-up efforts to date. We match distances measured by Gaia DR3, 2MASS photometry, and a 3D Galactic dust map to obtain luminous bright late-type stars. Determi…
The JWST weather report from the nearest brown dwarfs I: multiperiod JWST NIRSpec + MIRI monitoring of the benchmark binary brown dwarf WISE 1049AB
Henning, Thomas; Muirhead, Philip S.; Kataria, Tiffany +22 more
We report results from 8 h of JWST/MIRI low resolution spectroscopic (LRS) monitoring directly followed by 7 h of JWST/NIRSpec prism spectroscopic monitoring of the benchmark binary brown dwarf WISE 1049AB, the closest, brightest brown dwarfs known. We find water, methane, and CO absorption features in both components, including the 3.3 µm m…