Search Publications
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder - IV. Neutral carbon detection in the SPIRE FTS spectra
Valtchanov, Ivan; Scott, Jeremy P.; Spencer, Locke D. +2 more
The SPIRE Fourier Transform Spectrometer (FTS) Spectral Feature Finder (FF), developed within the Herschel Spectral and Photometric Imaging Receiver (SPIRE) FTS instrument team, is an automated spectral feature fitting routine that attempts to find significant features in SPIRE FTS spectra. The 3P1-3P0 a…
Multi-wavelength, spatially resolved modelling of HD 48682's debris disc
Marshall, J. P.; Horner, J.; Marsden, S. C. +1 more
Asteroids and comets (planetesimals) are created in gas- and dust-rich protoplanetary discs. The presence of these planetesimals around main-sequence stars is usually inferred from the detection of excess continuum emission at infrared wavelengths from dust grains produced by destructive processes within these discs. Modelling of the disc structur…
Low optical polarization at the core of the optically thin jet of M87
Merloni, A.; Prieto, M. A.; Acosta-Pulido, J. A. +2 more
We study the optical linear and circular polarization in the optically thin regime of the core and jet of M87. Observations were acquired two days before the Event Horizon Telescope (EHT) campaign in early 2017 April. A high degree (∼20 per cent) of linear polarization (Plin) is detected in the bright jet knots resolved at $\sim 10\,\ma…
A systematic study of spiral density waves in the accretion discs of cataclysmic variables
Groot, P. J.; Steeghs, D.; Ruiz-Carmona, R.
Spiral density waves are thought to be excited in the accretion discs of accreting compact objects, including cataclysmic variable stars (CVs). Observational evidence has been obtained for a handful of systems in outburst over the last two decades. We present the results of a systematic study searching for spiral density waves in CVs, and report t…
High-resolution spectroscopy of detached solar-type eclipsing binaries observed during the Kepler K2 mission
Çakırlı, Ö.; Hoyman, B.
Solar-type stars in eclipsing binaries are proving to be a remarkable resource of knowledge for testing models of stellar evolution, as spectroscopic and photometric studies have opened up a window into their interiors. Until recently, many cases have been worked out with Kepler data. In an ongoing effort to elucidate this research, we examine fiv…
Correlating the non-linear time series and spectral properties of IGR J17091-3624: is it similar to GRS 1915+105?
Misra, Ranjeev; Adegoke, Oluwashina; Mukhopadhyay, Banibrata
Using the correlation integral method, we explore the non-linear properties of IGR J17091-3624 by comparing the underlying behaviour to GRS 1915+105. We find that while GRS 1915+105 is known to reveal a combination of fractal (or even chaotic) and stochastic behaviours depending on its temporal class, IGR J17091-3624 mostly shows stochastic behavi…
The Gran Telescopio Canarias OSIRIS broad-band first data release
Cortés-Contreras, M.; Bouy, H.; Solano, E. +4 more
We present the first release of GTC OSIRIS broad-band data archive. This is an effort conducted in the framework of the Spanish Virtual Observatory to help optimize science from the Gran Telescopio Canarias Archive. Data Release 1 includes 6788 broad-band images in the Sloan griz filters obtained between 2009 April and 2014 January and the associa…
Identifying the lens galaxy B 1152+199 as a ghostly damped Lyman α system by the cosmic origins spectrograph
Chen, Bin; Dai, Xinyu; Bhatiani, Saloni
Strong quasar-galaxy lensing provides a powerful tool to probe the interstellar medium (ISM) of the lens galaxy using radiation from the background quasar. Using the Cosmic Origins Spectrograph (COS) on board the Hubble Space Telescope, we study the cold ISM properties of the lens galaxy in B 1152+199 at a redshift of z = 0.4377. Since existing op…
HP Cet and Swift J0820.6-2805: two candidate intermediate polars observed by XMM-Newton
Nucita, A. A.; De Paolis, F.; Strafella, F. +1 more
We report on the XMM-Newton observation of HP Cet and Swift J0820.6-2805, two X-ray photon sources that are candidates to be members of the intermediate polar class of cataclysmic variables. If the historical optical light curve of HP Cet shows a periodic feature at ≃96 min, a clear identification of such a signature in the high energy band (apart…
A global view on the colliding-wind binary WR 147
Zhekov, Svetozar A.; Tomov, Toma V.; Petrov, Blagovest V. +1 more
We present results from a global view on the colliding-wind binary WR 147. We analysed new optical spectra of WR 147 obtained with the Gran Telescopio Canarias and archive spectra from the Hubble Space Telescope by making use of modern atmosphere models accounting for optically thin clumping. We adopted a grid-modelling approach to derive some bas…