Search Publications
The mass and density of the dwarf planet (225088) 2007 OR10
Young, Leslie A.; Schwamb, Megan E.; Noll, Keith S. +10 more
The satellite of (225088) 2007 OR10 was discovered on archival Hubble Space Telescope images and along with new observations with the WFC3 camera in late 2017 we have been able to determine the orbit. The orbit's notable eccentricity, e ≈ 0.3, may be a consequence of an intrinsically eccentric orbit and slow tidal evolution, but may als…
Two p-mode-dominated subdwarf B pulsators in binaries with F-star companions observed with K2
Reed, M. D.; Jeffery, C. S.; Németh, P. +6 more
This paper presents spectroscopic and seismic analyses of two rare hybrid pulsating subdwarf B (sdB) stars, PG 0048+091 and PG 1315-123, which are dominated by pressure (p)-mode pulsations. These are only the second and third sdB pulsators with detected frequency multiplets in both the p- and g (gravity)-mode regions. This allows an examination of…
The dynamics and distribution of angular momentum in HiZELS star-forming galaxies at z = 0.8-3.3
Smail, Ian; Swinbank, A. M.; Glazebrook, K. +18 more
We present adaptive optics assisted integral field spectroscopy of 34 star-forming galaxies at z = 0.8-3.3 selected from the HiZELS narrow-band survey. We measure the kinematics of the ionized interstellar medium on ∼1 kpc scales, and show that the galaxies are turbulent, with a median ratio of rotational to dispersion support of V / σ = 0.82 ± 0.…
Multi-season optical modulation phased with the orbit of the super-Earth 55 Cancri e
Fossati, L.; Winn, J. N.; Lendl, M. +13 more
Context. 55 Cnc e is a transiting super-Earth orbiting a solar-like star with an orbital period of 17.7 h. In 2011, using the Microvariability and Oscillations in Stars (MOST) space telescope, a quasi-sinusoidal modulation in flux was detected with the same period as the planetary orbit. The amplitude of this modulation was too large to be explain…
Probing Polaris' puzzling radial velocity signals. Pulsational (in-)stability, orbital motion, and bisector variations
Anderson, R. I.
We investigate temporally changing variability amplitudes and the multi-periodicity of the type-I Cepheid Polaris using 161 high-precision radial velocity (RV) and bisector inverse span (BIS) measurements based on optical spectra recorded using Hermes at the 1.2 m Flemish Mercator telescope on La Palma, Canary Islands, Spain. Using an empirical te…
A new method for target selection in direct imaging programmes with COPAINS
Bonavita, M.; Biller, B.; Fontanive, C. +2 more
We present COPAINS (Code for Orbital Parametrization of Astrometrically Inferred New Systems), an innovative tool developed to identify previously undiscovered companions detectable via direct imaging, based on changes in stellar proper motions across multiple astrometric catalogues. This powerful procedure allows for dynamical predictions of the …
Large-scale Magnetic Funnels in the Solar Corona
Velli, Marco; Panasenco, Olga; Panasenco, Aram
We describe open coronal magnetic fields with a specific geometry—large-scale coronal magnetic funnels—that are found to play an important role in coronal dynamics. Coronal magnetic funnels can be attributed to three main factors: (i) the presence of pseudostreamer(s), (ii) the presence of filament channels, and (iii) the presence of active region…
Spectral Energy Distribution of Blue Stragglers in the Core of 47 Tucanae
Anderson, Jay; Pallanca, Cristina; Dalessandro, Emanuele +7 more
We have constructed the spectral energy distributions (SEDs) of a sample of blue straggler stars (BSSs) in the core of the globular cluster 47 Tucanae, taking advantage of the large set of high resolution images, ranging from the ultraviolet to the near-infrared, obtained with the Advanced Camera for Surveys/High Resolution Channel of the Hubble S…
An automated search for transiting exocomets
Wyatt, Mark C.; Hodgkin, Simon T.; Kennedy, Grant M. +1 more
This paper discusses an algorithm for detecting single transits in photometric time-series data. Specifically, we aim to identify asymmetric transits with ingress that is more rapid than egress, as expected for cometary bodies with a significant tail. The algorithm is automated, so can be applied to large samples and only a relatively small number…
SDSS J094635.06+101706.1: a redshift one, very radio-loud, γ-ray emitting narrow-line Seyfert 1 galaxy
Komossa, S.; Yuan, Weimin; Yi, Weimin +4 more
As hybrids of narrow-line Seyfert 1 (NLS1) galaxies and blazars, γ-ray emitting NLS1s are important probes of jet physics in the high Eddington-ratio regime. Only very few of them are known to date; the majority of them below redshift z = 0.5. Here, we present the identification of the γ-ray emitting AGN TXS 0943+105 (SDSS J094635.06+101706.1) as …