Search Publications
LoCuSS: exploring the connection between local environment, star formation, and dust mass in Abell 1758
Finoguenov, A.; Smith, G. P.; Egami, E. +3 more
We explore the connection between dust and star formation, in the context of environmental effects on galaxy evolution. In particular, we exploit the susceptibility of dust to external processes to assess the influence of dense environment on star-forming galaxies. We have selected cluster Abell 1758 from the Local Cluster Substructure Survey (LoC…
The closest extremely low-mass white dwarf to the Sun
Vennes, Stéphane; Simpson, Jeffrey D.; Marino, Anna F. +4 more
We present the orbit and properties of 2MASS J050051.85-093054.9, establishing it as the closest (d ≈ 71 pc) extremely low-mass white dwarf to the Sun. We find that this star is hydrogen rich with $T_\textrm {eff}\approx 10\, 500$ K, log g ≈ 5.9, and, following evolutionary models, has a mass of ≈0.17 M⊙. Independent analysis of radial …
Broadband X-ray analysis of 1E 1740.7-2942: constraints on spin, inclination, and a tentative black hole mass
Castro, M.; Stecchini, Paulo E.; Braga, J. +2 more
1E 1740.7-2942 is one of the strongest hard X-ray emitters in the Galactic Centre region, believed to be a black hole in a high-mass X-ray binary system. Although extensively studied in X-rays, many aspects about the underlying nature of the system are still unknown. For example, X-ray data analyses of 1E 1740.7-2942 to date have not yet unveiled …
CHEOPS observations of TESS primary mission monotransits
Lendl, Monika; Pollacco, Don; Cooke, Benjamin F. +2 more
We set out to look at the overlap between CHaracterizing ExOPlanets Satellite (CHEOPS) sky coverage and Transiting Exoplanet Survey Satellite (TESS) primary mission monotransits to determine what fraction of TESS monotransits may be observed by CHEOPS. We carry out a simulation of TESS transits based on the stellar population in TICv8 in the prima…
NGTS-12b: A sub-Saturn mass transiting exoplanet in a 7.53 day orbit
Wheatley, Peter J.; Bayliss, Daniel; Moyano, Maximiliano +35 more
We report the discovery of the transiting exoplanet NGTS-12b by the Next Generation Transit Survey (NGTS). The host star, NGTS-12, is a V = 12.38 mag star with an effective temperature of Teff = 5690 ± 130 K. NGTS-12b orbits with a period of P = 7.53 d, making it the longest period planet discovered to date by the main NGTS survey. We v…
Electron-positron pair plasma in TXS 0506+056 and the 'neutrino flare' in 2014-2015
Fraija, N.; Aguilar-Ruiz, E.; Galván-Gámez, A.
The detection of a prolonged flaring activity from blazar TXS 0506+056 in temporal and spatial coincidence with the energetic neutrino IceCube-170922A provided evidence about the photohadronic interactions in this source. However, analysis of the archival neutrino and multiwavelength data from the direction of this blazar between 2014 September an…
Stellar activity with LAMOST. III. Temporal variability pattern in Pleiades, Praesepe, and Hyades
Zhao, Gang; Bharat Kumar, Yerra; Bidin, Christian Moni +2 more
We present the results from a systematic study of temporal variation of stellar activity in young late-type stars. We used multi-epoch LAMOST (Large sky Area Multi-Object fiber Spectroscopic Telescope) low-resolution spectra of over 300 member candidates in three young open clusters: Pleiades, Praesepe, and Hyades. The spectral measurements of TiO…
The OH Megamaser galaxy IRAS11506-3851: an AGN and star formation revealed by multiwavelength observations
Robinson, Andrew; Storchi-Bergmann, Thaisa; Riffel, Rogemar A. +4 more
We present Gemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Hubble Space Telescope (HST), and Very Large Array (VLA) observations of the OH Megamaser (OHM) galaxy IRAS 11506-3851. The HST images reveal an isolated spiral galaxy and the combination with the GMOS-IFU flux distributions and VLA data allow us to identify a partial ri…
Illuminating a tadpole's metamorphosis III: quantifying past and present environmental impact
Reiter, Megan; Garay, Guido; McLeod, Anna F. +3 more
We combine Multi-Unit Spectroscopic Explorer and Atacama Large Millimeter/sub-millimeter Array observations with theoretical models to evaluate how a tadpole-shaped globule located in the Carina Nebula has been influenced by its environment. This globule is now relatively small (radius ~2500 au), hosts a protostellar jet+outflow (HH 900), and, wit…
Determining quasar orientation
Yong, Suk Yee; Bate, Nicholas F.; Webster, Rachel L. +3 more
Since the discovery of active galactic nuclei (AGN) and their subclasses, a unification scheme of AGN has been long sought. Orientation-based unified models predict that some of the diversity within AGN subclasses can be explained by the different viewing angles of the observer. Several orientation categorizations have been suggested, but a widely…