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Deep Spitzer/IRAC Data for z 10 Galaxies Reveal Blue Balmer Break Colors: Young Stellar Populations at 500 Myr of Cosmic Time
Illingworth, Garth D.; Labbé, Ivo; Bouwens, Rychard J. +3 more
We present the deepest constraints yet on the median rest-UV+optical spectral energy distribution (SED) of z ~ 10 galaxies prior to James Webb Space Telescope science operations. We constructed stacks based on four robust J 125 dropouts, previously identified across the GOODS fields. We used archival Hubble Space Telescope/Wide Field Ca…
The galaxy mass-size relation in CARLA clusters and proto-clusters at 1.4 < z < 2.8: Larger cluster galaxy sizes
Noirot, Gaël; Gonzalez, Anthony H.; Stern, Daniel +12 more
We study the galaxy mass-size relation in 15 spectroscopically confirmed clusters at 1.4 < z < 2.8 from the CARLA survey. Our clusters span a total stellar mass in the range 11.3 < log(M*c/M⊙) < 12.6 (with an approximate halo mass in the range 13.5 ≲ log(Mhc/M⊙) ≲ 14.5).…
Pavo: Discovery of a Star-forming Dwarf Galaxy Just Outside the Local Group
Strader, Jay; Sand, David J.; Jones, Michael G. +9 more
We report the discovery of Pavo, a faint (M V = -10.0), star-forming, irregular, and extremely isolated dwarf galaxy at D ≈ 2 Mpc. Pavo was identified in Dark Energy Camera Legacy Survey imaging via a novel approach that combines low surface brightness galaxy search algorithms and machine-learning candidate classifications. Follow-up …
A Novel Survey for Young Substellar Objects with the W-band Filter. VI. Spectroscopic Census of Substellar Members and the IMF of the σ Orionis Cluster
Herczeg, Gregory J.; Jose, Jessy; Allers, Katelyn +11 more
Low-mass stars and substellar objects are essential in tracing the initial mass function (IMF). We study the nearby young σ Orionis cluster (d ~ 408 pc, age ~ 1.8 Myr) using deep near-infrared (NIR) photometric data in the J, W, and H bands from WIRCam on the Canada-France-Hawaii Telescope. We use the water absorption feature to select brown dwarf…
A Database of Magnetic and Thermodynamic Properties of Confined and Eruptive Solar Flares
Kazachenko, Maria D.
Solar flares sometimes lead to coronal mass ejections that directly affect Earth's environment. However, a large fraction of flares, including on solar-type stars, are confined flares. What are the differences in physical properties between confined and eruptive flares? For the first time, we quantify the thermodynamic and magnetic properties of h…
Unveiling the Formation of the Massive DR21 Ridge
Schneider, N.; Csengeri, T.; Bontemps, S. +10 more
We present new 13CO (1-0), C18O (1-0), HCO+ (1-0), and H13CO+ (1-0) maps from the IRAM 30 m telescope and a spectrally resolved [C II] 158 µm map observed with the SOFIA telescope toward the massive DR21 cloud. This traces the kinematics from low- to high-density gas in the cloud, which …
An M dwarf accompanied by a close-in giant orbiter with SPECULOOS
Triaud, Amaury H. M. J.; Tamura, Motohide; Hirano, Teruyuki +40 more
In the last decade, a dozen close-in giant planets have been discovered orbiting stars with spectral types ranging from M0 to M4, a mystery since known formation pathways do not predict the existence of such systems. Here, we confirm TOI-4860 b, a Jupiter-sized planet orbiting an M4.5 host, a star at the transition between fully and partially conv…
Galactic runaway O and Be stars found using Gaia DR3
Paredes, J. M.; Ribó, M.; Carretero-Castrillo, M.
Context. A relevant fraction of massive stars are runaway stars. These stars move with a significant peculiar velocity with respect to their environment.
Aims: We aim to discover and characterize the population of massive and early-type runaway stars in the GOSC and BeSS catalogs using Gaia DR3 astrometric data.
Methods: We present a two…
Temporal variation of the photometric magnetic activity for the Sun and Kepler solar-like stars
García, R. A.; Mathur, S.; Jiménez, A. +9 more
Context. The photometric time series of solar-like stars can exhibit rotational modulation, that is, brightness variations due to active regions co-rotating with the stellar surface. These signatures allow us to constrain properties of stellar rotation and magnetic activity.
Aims: In this work we investigate the behavior, particularly the var…
The mass of TOI-519 b: A close-in giant planet transiting a metal-rich mid-M dwarf
Ikuta, Kai; Tamura, Motohide; Hirano, Teruyuki +33 more
We report on the determination of the mass of TOI-519 b, a transiting substellar object around a mid-M dwarf. We carried out radial velocity measurements using Subaru/InfraRed Doppler (IRD), revealing that TOI-519 b is a planet with a mass of $0.463^{+0.082}_{-0.088}\, M_{\rm Jup}$. We also found that the host star is metal rich ([Fe/H] = 0.27 ± 0…