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TESS-Gaia Light Curve: A PSF-based TESS FFI Light-curve Product
Brandt, Timothy D.; Han, Te
The Transiting Exoplanet Survey Satellite (TESS) is continuing its second extended mission after 55 sectors of observations. TESS publishes full-frame images (FFIs) at a cadence of 1800, 600, or 200 s, allowing light curves to be extracted for stars beyond a limited number of pre-selected stars. Simulations show that thousands of exoplanets, eclip…
Sub-per-cent determination of the brightness at the tip of the red giant branch in the Magellanic Clouds
Hoyt, Taylor J.
The value of the Hubble constant as constrained by type Ia supernovae is directly tied to the zero point of the extragalactic distance scale, which is in turn set by the calibration of astrophysical distance indicators such as the tip of the red giant branch (TRGB). In this article, a calibration of the TRGB luminosity is determined in the Magella…
Photometric Metallicity and Distance Estimates for 136,000 RR Lyrae Stars from Gaia Data Release 3
Huang, Yang; Liu, Gao-Chao; Beers, Timothy C. +2 more
We present a sample of 135,873 RR Lyrae stars (RRLs) with precise photometric metallicity and distance estimates from our newly calibrated P-ϕ 31-R 21-[Fe/H]/P-R 21-[Fe/H] and G-band absolute magnitude-metallicity relations. The P-ϕ 31-R 21-[Fe/H] and P-R 21-[Fe/H] relations for typ…
The distribution of globular clusters in kinematic spaces does not trace the accretion history of the host galaxy
Haywood, M.; Mastrobuono-Battisti, A.; Combes, F. +4 more
Context. Reconstructing how all the stellar components of the Galaxy formed and assembled over time by studying the properties of the stars that form it is the aim of Galactic archaeology. Thanks to the launch of the ESA Gaia astrometric mission and the development of many spectroscopic surveys in recent years, we are for the first time in the pos…
Little Red Dots or Brown Dwarfs? NIRSpec Discovery of Three Distant Brown Dwarfs Masquerading as NIRCam-selected Highly Reddened Active Galactic Nuclei
Langeroodi, Danial; Hjorth, Jens
Cold, substellar objects such as brown dwarfs have long been recognized as contaminants in color-selected samples of active galactic nuclei (AGNs). In particular, their near- to mid-infrared colors (1-5 µm) can closely resemble the V-shaped (f λ ) spectra of highly reddened accreting supermassive black holes ("little red dots"), …
On the Cosmic Evolution of AGN Obscuration and the X-Ray Luminosity Function: XMM-Newton and Chandra Spectral Analysis of the 31.3 deg2 Stripe 82X
Kirkpatrick, Allison; Marchesi, Stefano; LaMassa, Stephanie +11 more
We present X-ray spectral analysis of XMM-Newton and Chandra observations in the 31.3 deg2 Stripe-82X (S82X) field. Of the 6181 unique X-ray sources in this field, we analyze a sample of 2937 candidate active galactic nuclei (AGNs) with solid redshifts and sufficient counts determined by simulations. Our results show an observed populat…
Spherical symmetry in the kilonova AT2017gfo/GW170817
Kotak, Rubina; Watson, Darach; Sim, Stuart +5 more
The mergers of neutron stars expel a heavy-element enriched fireball that can be observed as a kilonova1-4. The kilonova's geometry is a key diagnostic of the merger and is dictated by the properties of ultra-dense matter and the energetics of the collapse to a black hole. Current hydrodynamical merger models typically show aspherical e…
Constraints on primordial curvature spectrum from primordial black holes and scalar-induced gravitational waves
Yi, Zhu; Fei, Qin
The observational data of primordial black holes and scalar-induced gravitational waves can constrain the primordial curvature perturbation at small scales. We parameterize the primordial curvature perturbation by a broken power law form and find that it is consistent with many inflation models that can produce primordial black holes, such as nonm…
PHANGS-JWST First Results: Tracing the Diffuse Interstellar Medium with JWST Imaging of Polycyclic Aromatic Hydrocarbon Emission in Nearby Galaxies
Sandstrom, Karin M.; Bolatto, Alberto D.; Henshaw, Jonathan D. +43 more
JWST observations of polycyclic aromatic hydrocarbon (PAH) emission provide some of the deepest and highest resolution views of the cold interstellar medium (ISM) in nearby galaxies. If PAHs are well mixed with the atomic and molecular gas and illuminated by the average diffuse interstellar radiation field, PAH emission may provide an approximatel…
Constraints on light decaying dark matter candidates from 16 yr of INTEGRAL/SPI observations
Calore, F.; Dekker, A.; Serpico, P. D. +1 more
We apply the recently developed analysis of 16 yr of INTEGRAL/SPI data including a dark matter spatial template to derive bounds on dark matter candidates lighter than weakly interacting massive particles (like sterile neutrinos or axion-like particles) decaying into line or continuum electromagnetic final state channels. The bounds obtained are t…