Search Publications
TOI-179: A young system with a transiting compact Neptune-mass planet and a low-mass companion in outer orbit
Marzari, F.; Girard, J.; Sozzetti, A. +29 more
Context. Transiting planets around young stars are key benchmarks for our understanding of planetary systems. One such candidate, TOI-179, was identified around the K dwarf HD 18599 by TESS.
Aims: We present the confirmation of the transiting planet and the characterization of the host star and of the TOI-179 system over a broad range of angu…
Cometary surface dust layers built out of millimetre-scale aggregates: dependence of modelled cometary gas production on the layer transport properties
Mottola, S.; Küppers, M.; Hartogh, P. +5 more
The standard approach to obtaining knowledge about the properties of the surface layer of a comet from observations of gas production consists of two stages. First, various thermophysical models are used to calculate gas production for a few sets of parameters. Second, a comparison of observations and theoretical predictions is performed. This app…
Enhanced Size Uniformity for Near-resonant Planets
Dai, Fei; Wang, Songhu; Goyal, Armaan V.
Super-Earths within the same close-in, compact planetary system tend to exhibit a striking degree of uniformity in their radius, mass, and orbital spacing, and this "peas-in-a-pod" phenomenon itself serves to provide one of the strongest constrains on planet formation at large. While it has been recently demonstrated from independent samples that …
Effective Temperature Estimations from Line Depth Ratios in the H- and K-band Spectra of IGRINS
Jaffe, Daniel T.; Mace, Gregory N.; Afşar, Melike +5 more
Determining accurate effective temperatures of stars buried in the dust-obscured Galactic regions is extremely difficult from photometry. Fortunately, high-resolution infrared spectroscopy is a powerful tool for determining the temperatures of stars with no dependence on interstellar extinction. It has long been known that the depth ratios of temp…
Phenomenological modelling of the Crab Nebula's broadband energy spectrum and its apparent extension
Horns, D.; Dirson, L.
Context. The Crab Nebula emits exceptionally bright non-thermal radiation across the entire wavelength range from the radio to the most energetic photons. So far, the underlying physical model of a relativistic wind from the pulsar terminating in a hydrodynamic standing shock has remained fairly unchanged since the early 1970s when it was first in…
An APEX Study of Molecular Outflows in FUor-type Stars
Henning, Thomas; Ábrahám, Péter; Kóspál, Ágnes +4 more
The FU Orionis-type objects (FUors) are low-mass pre-main-sequence objects that go through a short-lived phase (~100 yr) of increased mass accretion rate (from 10-8 to 10-4 M ⊙ yr-1). These eruptive young stars are in the early stages of stellar evolution and thus still deeply embedded in a massive envel…
The orbital period versus absolute magnitude relationship of intermediate polars: implications for low states and outbursts
Mukai, Koji; Pretorius, Magaretha L.
Recent advances in time-domain astronomy have led to fresh observational insights into intermediate polars, a subtype of magnetic cataclysmic variables generally accreting via a partial accretion disc. These new discoveries include detections of superhumps, low states, and outbursts. However, these studies have largely relied on relative photometr…
The Spin-Orbit Misalignment of TOI-1842b: The First Measurement of the Rossiter-McLaughlin Effect for a Warm Sub-Saturn around a Massive Star
Rice, Malena; Wang, Songhu; Hixenbaugh, Kyle +1 more
The mechanisms responsible for generating spin-orbit misalignments in exoplanetary systems are still not fully understood. It is unclear whether these misalignments are related to the migration of hot Jupiters or are a consequence of general star and planet formation processes. One promising method to address this question is to constrain the dist…
As Simple as Possible but No Simpler: Optimizing the Performance of Neural Net Emulators for Galaxy SED Fitting
Johnson, Benjamin D.; Tacchella, Sandro; Suess, Katherine A. +7 more
Artificial neural network emulators have been demonstrated to be a very computationally efficient method to rapidly generate galaxy spectral energy distributions, for parameter inference or otherwise. Using a highly flexible and fast mathematical structure, they can learn the nontrivial relationship between input galaxy parameters and output obser…
Value-added Catalog of M-giant Stars in LAMOST DR9
Chen, Li; Zhong, Jing; Xue, Xiang-Xiang +9 more
In this work, we update the catalog of M-giant stars from the low-resolution spectra of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 9. There are 58,076 M giants identified from the classification pipeline with seven temperature subtypes from M0 to M6. The 2471 misclassified non-M-giant stars are white dwarf …