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Uncovering the ultimate planet impostor. An eclipsing brown dwarf in a hierarchical triple with two evolved stars
Montesinos, B.; Bouy, H.; Barrado, D. +14 more
Context. Exoplanet searches through space-based photometric time series have shown to be very efficient in recent years. However, follow-up efforts on the detected planet candidates have been demonstrated to be critical to uncover the true nature of the transiting objects.
Aims: In this paper we show a detailed analysis of one of those false …
Extremely weak CO emission in IZw 18
Wang, Junzhi; Zhang, Zhi-Yu; Shi, Yong +1 more
Local metal-poor galaxies are ideal analogues of primordial galaxies with the interstellar medium (ISM) barely being enriched with metals. However, it is unclear whether carbon monoxide remains a good tracer and coolant of molecular gas at low metallicity. Based on the observation with the upgraded Northern Extended Millimeter Array, we report a m…
The Carina Nebula and Gum 31 Molecular Complex. III. The Distribution of the 1-3 GHz Radio Continuum across the Whole Nebula
Garay, Guido; Breen, Shari L.; Rebolledo, David +2 more
We report the most detailed 1-3 GHz radio continuum emission map of the nearest region of massive-star formation, the Carina Nebula. As part of a large program with the Australia Telescope Compact Array, we have covered ∼12 deg2, achieving an angular resolution of ∼16″, representing the largest and most complete map of the radio continu…
Re-Analysis of the Cassini RPWS/LP Data in Titan's Ionosphere: 1. Detection of Several Electron Populations
Wahlund, J. -E.; Edberg, N. J. T.; Hadid, L. Z. +5 more
Current models of Titan's ionosphere have difficulties in explaining the observed electron density and/or temperature. In order to get new insights, we re-analyzed the data taken in the ionosphere of Titan by the Cassini Langmuir probe (LP), part of the Radio and Plasma Wave Science (RPWS) instrument. This is the first of two papers that present t…
Observation of bi-directional jets in a prominence
Polito, V.; Hillier, A.
Quiescent prominences host a large range of flows, many driven by buoyancy, which lead to velocity shear. The presence of these shear flows could bend and stretch the magnetic field resulting in the formation of current sheets which can lead to magnetic reconnection. Though this has been hypothesised to occur in prominences, with some observations…
Spectroscopic Monitoring of the Candidate Tidal Disruption Event in F01004-2237
Jonker, Peter G.; Cannizzaro, Giacomo; Mata-Sánchez, D.
We present results of spectroscopic monitoring observations of the ultraluminous infrared galaxy F01004-2237. This galaxy was observed to undergo changes in its optical spectrum, detected by comparing a spectrum from 2015 with one from 2000. These changes were coincident with photometric brightening. The main changes detected in the optical spectr…
The Fundamental Plane of Massive Quiescent Galaxies at z ∼ 2
Conselice, Christopher J.; Gallazzi, Anna; Zibetti, Stefano +11 more
We examine the Fundamental Plane (FP) and mass-to-light ratio (M/L) scaling relations using the largest sample of massive quiescent galaxies at 1.5 < z < 2.5 to date. The FP (re, σe, Ie) is established using 19 UVJ quiescent galaxies from COSMOS with Hubble Space Telescope HF160W rest-frame optical…
Are we observing an NSC in course of formation in the NGC 4654 galaxy?
Mastrobuono-Battisti, A.; Georgiev, I. Y.; Capuzzo-Dolcetta, R. +2 more
We use direct N-body simulations to explore some possible scenarios for the future evolution of two massive clusters observed towards the centre of NGC 4654, a spiral galaxy with mass similar to that of the Milky Way. Using archival HST data, we obtain the photometric masses of the two clusters, M = 3 × 105 M⊙ and M = 1.7 × 1…
Low-frequency Waves due to Newborn Interstellar Pickup He+ Observed by the Ulysses Spacecraft
Isenberg, Philip A.; Schwadron, Nathan A.; Murphy, Neil +8 more
We have surveyed magnetic field data from the Ulysses spacecraft and found examples of magnetic waves with the expected characteristics that point to excitation by newborn pickup He+. With interstellar neutrals as the likely source for the pickup ions, we have modeled the ion production rates and used them to produce wave excitation rat…
Seeking Echoes of Circumstellar Disks in Kepler Light Curves
Kenyon, Scott J.; Bromley, Benjamin C.; Leonard, Austin +3 more
Light echoes of flares on active stars offer the opportunity for direct detection of circumstellar dust. We revisit the problem of identifying faint echoes in postflare light curves, focusing on debris disks from ongoing planet formation. Starting with simulations, we develop an algorithm for estimating the radial extent and total mass from disk e…