Search Publications
3D hydrodynamical models of point-symmetric planetary nebulae: the special case of H 1-67
Velázquez, P. F.; Peña, M.; Rechy-García, J. S.
We present 3D hydrodynamical simulations of a precessing jet with a time-dependent ejection velocity or a time-dependent ejection density, interacting with a circumstellar medium given by a dense, anisotropic, and slow AGB wind, forming a torus. We explore a set of configurations with different values for the precession angle and number of ejectio…
The Habitability of GJ 357D: Possible Climate and Observability
Pallé, E.; Kaltenegger, L.; Luque, R. +5 more
The GJ 357 system harbors three planets orbiting a bright, nearby M2.5V star at 9.44 pc. The innermost planet, GJ 357b (TOI-562.01), is a hot transiting Earth-sized planet with Earth-like density, which receives about 12 times the irradiation Earth receives from the Sun, and was detected using data from TESS. Radial velocities discovered two more …
A Fast Approximate Approach to Microlensing Survey Analysis
Pepper, Joshua; Khakpash, Somayeh; Penny, Matthew
Microlensing can be used to discover exoplanets of a wide range of masses with orbits beyond ∼1 au, and even free-floating planets. The Wide Field Infrared Survey Telescope (WFIRST) mission will use microlensing to discover approximately 1600 planets by monitoring ∼100 million stars to find ∼50,000 microlensing events. Modeling each microlensing e…
Spectral Properties of Heavily Obscured Seyfert Galaxies from the INTEGRAL All-Sky Survey
Sazonov, S. Yu.; Krivonos, R. A.; Semena, A. N.
We have investigated the X-ray spectral properties of the ten heavily obscured nearby ( z < 0.1) active galactic nuclei (AGNs) IGR J00256+6821, NGC 1194, CGCG 420-015, IGR J09253+6929, NGC 3281, NGC 4939, IGR J14175-4641, NGC 5643, NGC 5728, and ESO 137-G034 from the catalogue of hard X-ray sources detected during the INTEGRAL seven-year all-sk…
Exploring the multiphase medium in MKW 08: from the central active galaxy up to cluster scales
Ercan, E. N.; Bourdin, H.; Gaspari, M. +3 more
Context. The study of the brightest cluster galaxy (BCG) coronae embedded in noncool core (NCC) galaxy clusters is crucial to understand the BCG's role in galaxy cluster evolution as well as the activation of the self-regulated cooling and heating mechanism in the central regions of galaxy clusters.
Aims: We explore the X-ray properties of th…
30-micron sources in galaxies with different metallicities
Szczerba, R.; Lagadec, E.; Volk, K. +2 more
Aims: We present an analysis and comparison of the 30 µm dust features seen in the Spitzer Space Telescope spectra of 207 carbon-rich asymptotic giant branch (AGB) stars, post-AGB objects, and planetary nebulae (PNe) located in the Milky Way, the Magellanic Clouds (MCs), or the Sagittarius dwarf spheroidal galaxy (Sgr dSph), which are c…
Spectroscopic Redshift of the Gamma-Ray Blazar B2 1215+30 from Lyα Emission
Furniss, A.; Johnson, C. A.; Williams, D. A. +4 more
We report on Cosmic Origin Spectrograph observations of the gamma-ray bright blazar B2 1215+30, collected in 2015 November. These observations allow for the confirmation of the source redshift from the detection of a Lyα emission feature at λ ∼ 1374 Å. The emission feature places the source at a redshift of z = 0.1305 ± 0.003, confirming the sourc…
Catalog of equatorial coordinates and B‑magnitudes of the Kitab's part of the FON project
Andruk, V.; Yuldoshev, Q.; Relke, H. +3 more
We present a catalog of stars with equatorial coordinates α and δ and B‑magnitudes of stars for the Kitab's section of the FON project (FON‑Kitab). The photographic plates of the FON project were exposed on the double telescope Double Zeiss Astrograph (DAZ, D/F = 40/300, 69″/mm) at the Kitab observatory of the Republic of Uzbekistan. A total of 19…
HR 10: a main-sequence binary with circumstellar envelopes around both components. Discovery and analysis
Eiroa, C.; Montesinos, B.; Absil, O. +16 more
Context. This paper is framed within a large project devoted to studying the presence of circumstellar material around main sequence stars, and looking for exocometary events. The work concentrates on HR 10 (A2 IV/V), known for its conspicuous variability in the circumstellar narrow absorption features of Ca II K and other lines, so far interprete…
Emission-line Metallicities from the Faint Infrared Grism Survey and VLT/MUSE
Finkelstein, Steven L.; Hathi, Nimish; Windhorst, Rogier +20 more
We derive direct-measurement gas-phase metallicities of 7.4< 12+{log}({{O}}/{{H}})< 8.4 for 14 low-mass emission-line galaxies at 0.3 < z < 0.8 identified in the Faint Infrared Grism Survey. We use deep slitless G102 grism spectroscopy of the Hubble Ultra Deep Field, dispersing light from all objects in the field at wavelengths between…