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Time-resolved Hubble Space Telescope Wide Field Camera 3 Spectrophotometry Reveals Inefficient Day-to-night Heat Redistribution in the Highly Irradiated Brown Dwarf SDSS 1557B
Mayorga, L. C.; Lothringer, Joshua D.; Apai, Dániel +8 more
Brown dwarfs (BDs) in ultra-short-period orbits around white dwarfs (WDs) offer a unique opportunity to study the properties of tidally locked, fast-rotating (1–3 hr), and highly irradiated atmospheres. Here we present phase-resolved spectrophotometry of the WD–BD binary SDSS 1557, which is the fifth WD–BD binary in our six-object sample. Using th…
M 1-92: The Death of an AGB Star Told by Its Isotopic Ratios
Sánchez Contreras, Carmen; Masa, Elisa; Alcolea, Javier +3 more
Ongoing improvements in the sensitivity of sub-mm- and mm-range interferometers and single-dish radio telescopes allow for the increasingly detailed study of AGB and post-AGB objects in molecular species other than
An Extremely Young Protostellar Core, MMS 1/OMC-3: Episodic Mass Ejection History Traced by the Micro SiO Jet
Herczeg, Gregory J.; Johnstone, Doug; Mairs, Steve +11 more
We present ∼0.″2 (∼80 au) resolution observations of the CO(2–1) and SiO(5–4) lines made with the Atacama large millimeter/submillimeter array toward an extremely young intermediate-mass protostellar source (t dyn < 1000 yr), MMS 1 located in the Orion Molecular Cloud-3 region. We have successfully imaged a very compact CO molecular …
On the Connection between the Repeated X-Ray Quasiperiodic Oscillation and Warm Absorber in the Active Galaxy RE J1034+396
Nicastro, Fabrizio; Mao, Junjie; Wang, Yijun +3 more
We conduct an in-depth spectral analysis of ∼1 Ms XMM-Newton data of the narrow line Seyfert 1 galaxy RE J1034+396. The long exposure ensures high spectral quality and provides us with a detailed look at the intrinsic absorption and emission features toward this target. Two warm-absorber (WA) components with different ionization states ( $\mathrm{…
Spectral characterisation of the extinction properties of NGC 3603 using JWST NIRSpec
De Marchi, Guido; Brandl, Bernhard; Rogers, Ciarán
Context. A necessary ingredient in understanding the star formation history of a young cluster is knowledge of the extinction towards the region. This has typically been done by making use of the colour-difference method with photometry, or similar methods utilising the colour-colour diagram. These approaches rely on adopting an extinction law wit…
The X-ray binaries in M83: Will any of them form gravitational wave sources for LIGO-VIRGO-KAGRA?
Kotko, I.; Belczynski, K.
There are 214 X-ray point sources (LX > 1035 erg s−1) identified as X-ray binaries (XRBs) in the nearby spiral galaxy M83. Since XRBs are powered by accretion onto a neutron star (NS) or a black hole (BH) from a companion or donor star, these systems are promising progenitors of merging double compact objects (D…
Ages and metallicities of globular clusters in M81 using GTC/OSIRIS spectra
Cortesi, Arianna; Gómez-González, V. M. A.; Alzate, Jairo A. +8 more
We here present the results of an analysis of the optical spectroscopy of 42 globular cluster (GC) candidates in the nearby spiral galaxy M81 (3.61 Mpc). The spectra were obtained using the long-slit and multi-object spectroscopic modes of the OSIRIS instrument at the 10.4-m Gran Telescopio Canarias at a spectral resolution of ~1000. We used the c…
The FENIKS Survey: Multiwavelength Photometric Catalog in the UDS Field, and Catalogs of Photometric Redshifts and Stellar Population Properties
Papovich, Casey; Muzzin, Adam; Glazebrook, Karl +11 more
We present the construction of a deep multiwavelength point-spread-function-matched photometric catalog in the Ultra-Deep Survey (UDS) field following the final UKIDSS UDS release. The catalog includes photometry in 24 filters, from the MegaCam-uS 0.38 µm band to the Spitzer-IRAC 8 µm band, over ∼0.9 deg2 and with a 5σ depth…
Optical tomography of the born-again ejecta of A 58
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +2 more
In a born-again planetary nebula (PN), processed H-deficient material has been injected inside the old, H-rich nebula as a result of a very late thermal pulse (VLTP) event. Long-slit spectra have been used to unveil the chemical and physical differences between these two structures, but the ejection and shaping processes still remain unclear. To p…
Secular stability of surface abundance structures in the rapidly rotating Ap star 56 Ari
Potravnov, I.; Ryabchikova, T.; Piskunov, N.
The combination of the surface magnetic and abundance inhomogeneities in chemically peculiar Ap/Bp stars is responsible for their rotationally modulated variability. Within the framework of the fossil field hypothesis, these inhomogeneities are considered to be essentially stable over the main sequence timescale. However, a small group of Ap/Bp st…