Search Publications
Missions
Journals
Publication Years
Cepheid Metallicity in the Leavitt Law (C- MetaLL) survey - II. High-resolution spectroscopy of the most metal poor Galactic Cepheids
Ripepi, V.; Marconi, M.; Musella, I. +5 more
Classical Cepheids (DCEPs) are the first fundamental step in the calibration of the cosmological distance ladder. Furthermore, they represent powerful tracers in the context of Galactic studies. We have collected high-resolution spectroscopy with UVES@VLT for a sample of 65 DCEPs. The majority of them are the faintest DCEPs ever observed in the Mi…
Traveling kink oscillations of coronal loops launched by a solar flare
Tian, Hui; Li, Dong; Ji, Kaifan +5 more
Context. Kink oscillations, which are often associated with magnetohydrodynamic waves, are usually identified as transverse displacement oscillations of loop-like structures. However, the traveling kink oscillation evolving to a standing wave has rarely been reported.
Aims: We investigate the traveling kink oscillation triggered by a solar fl…
PHANGS-JWST First Results: A Global and Moderately Resolved View of Mid-infrared and CO Line Emission from Galaxies at the Start of the JWST Era
Ellison, Sara L.; Wilson, Christine D.; Bolatto, Alberto D. +42 more
We explore the relationship between mid-infrared (mid-IR) and CO rotational line emission from massive star-forming galaxies, which is one of the tightest scalings in the local universe. We assemble a large set of unresolved and moderately (~1 kpc) spatially resolved measurements of CO (1-0) and CO (2-1) intensity, I CO, and mid-IR inte…
Timing the r-process Enrichment of the Ultra-faint Dwarf Galaxy Reticulum II
Brown, Thomas M.; Bacon, D.; Smith, M. +65 more
The ultra-faint dwarf galaxy Reticulum II (Ret II) exhibits a unique chemical evolution history, with ${72}_{-12}^{+10}$ % of its stars strongly enhanced in r-process elements. We present deep Hubble Space Telescope photometry of Ret II and analyze its star formation history. As in other ultra-faint dwarfs, the color-magnitude diagram is best fit …
Resolved imaging confirms a radiation belt around an ultracool dwarf
Kao, Melodie M.; Shkolnik, Evgenya L.; Mioduszewski, Amy J. +1 more
Radiation belts are present in all large-scale Solar System planetary magnetospheres: Earth, Jupiter, Saturn, Uranus and Neptune1. These persistent equatorial zones of relativistic particles up to tens of megaelectron volts in energy can extend further than ten times the planet's radius, emit gradually varying radio emissions2-4
A BayeSN distance ladder: H0 from a consistent modelling of Type Ia supernovae from the optical to the near-infrared
Narayan, Gautham; Jha, Saurabh W.; Dhawan, Suhail +4 more
The local distance ladder estimate of the Hubble constant (H0) is important in cosmology, given the recent tension with the early universe inference. We estimate H0 from the Type Ia supernova (SN Ia) distance ladder, inferring SN Ia distances with the hierarchical Bayesian SED model, BayeSN. This method has a notable advantag…
Updated constraints on primordial black hole evaporation
Korwar, Mrunal; Profumo, Stefano
The Hawking evaporation process, leading to the production of detectable particle species, constrains the abundance of light black holes, presumably of primordial origin. Here, we reconsider and correct constraints from soft gamma-ray observations, including of the gamma-ray line, at 511 keV, produced by electron-positron pair-annihilation, where …
Plasmoids, Flows, and Jets during Magnetic Reconnection in a Failed Solar Eruption
Antiochos, Spiro K.; Kumar, Pankaj; Cho, Kyung-Suk +3 more
We report a detailed analysis of a failed eruption and flare in active region 12018 on 2014 April 3 using multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly, IRIS, STEREO, and Hinode/Solar Optical Telescope. At least four jets were observed to emanate from the cusp of this small active region (large brigh…
Revisiting the atmosphere of the exoplanet 51 Eridani b with VLT/SPHERE
Rouan, D.; Henning, Th.; Brandner, W. +27 more
Aims: We aim to better constrain the atmospheric properties of the directly imaged exoplanet 51 Eri b using a retrieval approach with data of higher signal-to-noise ratio (S/N) than previously reported. In this context, we also compare the results from an atmospheric retrieval to using a self-consistent model to fit atmospheric parameters.
Extension of HOPS out to 500 pc (eHOPS). I. Identification and Modeling of Protostars in the Aquila Molecular Clouds
Manoj, P.; Narang, Mayank; Gutermuth, Robert A. +14 more
We present a Spitzer/Herschel focused survey of the Aquila molecular clouds (d ~ 436 pc) as part of the eHOPS (extension of the Herschel orion protostar survey, or HOPS, Out to 500 ParSecs) census of nearby protostars. For every source detected in the Herschel/PACS bands, the eHOPS-Aquila catalog contains 1-850 µm SEDs assembled from the Two…