499 citations · 6.2k across the 126 of their papers we have counts for
20 papers · 1 filter
Spectral and orbital characterisation of the directly imaged giant planet HIP 65426 b
A. C. Cheetham, M. Samland, S. S. Brems +38
HIP 65426 b is a recently discovered exoplanet imaged during the course of the SPHERE-SHINE survey. Here we present new and observations of the planet from the NACO instr…
High-resolution spectroscopy of Boyajian's star during optical dimming events
M. J. Martínez González, C. González-Fernández, A. Asensio Ramos +13
Boyajian's star is an apparently normal main sequence F-type star with a very unusual light curve. The dipping activity of the star, discovered during the Kepler mission, presents…
The wavelength dependence of interstellar polarization in the Local Hot Bubble
Daniel V. Cotton, Jonathan P. Marshall, Priscilla C. Frisch +6
The properties of dust in the interstellar medium (ISM) nearest the Sun are poorly understood because the low column densities of dust toward nearby stars induce little photometric…
The Little Dippers: Transits of Star-grazing Exocomets?
Megan Ansdell, Eric Gaidos, Tom L. Jacobs +9
We describe EPIC 205718330 and EPIC 235240266, two systems identified in the K2 data whose light curves contain episodic drops in brightness with shapes and durations similar to th…
An automated search for transiting exocomets
Grant M. Kennedy, Greg Hope, Simon T. Hodgkin +1
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 rapi…
Detection of a giant flare displaying quasi-periodic pulsations from a pre-main sequence M star with NGTS
James A. G. Jackman, Peter J. Wheatley, Chloe E. Pugh +18
We present the detection of an energetic flare on the pre-main sequence M3 star NGTS J121939.5-355557, which we estimate as only 2 Myr old. The flare had an energy of $3.2\pm^{0.4}…
Science with an ngVLA: Debris disk structure and composition
Brenda Matthews, Jane Greaves, Grant Kennedy +3
Debris disks, comprised of planetsimal belts and the dust and gas produced by their mutual collisions, are the longest-lived phase of circumstellar disks. Typically much fainter in…
The HOSTS Survey for Exozodiacal Dust: Preliminary results and future prospects
S. Ertel, G. M. Kennedy, D. Defrère +40
[abridged] The presence of large amounts of dust in the habitable zones of nearby stars is a significant obstacle for future exo-Earth imaging missions. We executed an N band nulli…
Using warm dust to constrain unseen planets
Amy Bonsor, Mark C. Wyatt, Quentin Kral +3
Cold outer debris belts orbit a significant fraction of stars, many of which are planet-hosts. Radiative forces from the star lead to dust particles leaving the outer belts and spi…
Constraining the presence of giant planets in two-belt debris disk systems with VLT/SPHERE direct imaging and dynamical arguments
Elisabeth Matthews, Sasha Hinkley, Arthur Vigan +10
Giant, wide-separation planets often lie in the gap between multiple, distinct rings of circumstellar debris: this is the case for the HR\,8799 and HD\,95086 systems, and even the…
The KIC 8462852 Light Curve From 2015.75 to 2018.18 Shows a Variable Secular Decline
Bradley E. Schaefer, Rory O. Bentley, Tabetha S. Boyajian +19
The star KIC 8462852 (Boyajian's Star) displays both fast dips of up to 20% on time scales of days, plus long-term secular fading by up to 19% on time scales from a year to a centu…
Empty gaps? Depleting annular regions in debris discs by secular resonance with a two-planet system
Ben Yelverton, Grant M. Kennedy
We investigate the evolution on secular time-scales of a radially extended debris disc under the influence of a system of two coplanar planets interior to the disc, showing that th…
Unlocking the secrets of the midplane gas and dust distribution in the young hybrid disc HD 141569
James Miley, Olja Panic, Mark Wyatt +1
HD141569 is a pre-main sequence star with a disc uniquely placed between protoplanetary and debris discs, similar to the older `hybrid' type discs. This work aims to place the mass…
Exocomet Orbit Fitting: Accelerating Coma Absorption During Transits of Pictoris
Grant M. Kennedy
Comets are a remarkable feature in our night sky, visible on their passage through the inner Solar system as the Sun's energy sublimates ices and liberates surface material, genera…
Infrared colours and inferred masses of metal-poor giant stars in the Kepler field
Andrew R. Casey, Grant M. Kennedy, Tom R. Hartle +1
Intrinsically luminous giant stars in the Milky Way are the only potential volume-complete tracers of the distant disk, bulge, and halo. The chemical abundances of metal-poor giant…
Kuiper Belt Analogues in Nearby M-type Planet-host Systems
Grant M. Kennedy, Geoffrey Bryden, David Ardila +6
We present the results of a Herschel survey of 21 late-type stars that host planets discovered by the radial velocity technique. The aims were to discover new disks in these system…
Circumbinary, not transitional: On the spiral arms, cavity, shadows, fast radial flows, streamers and horseshoe in the HD142527 disc
Daniel J. Price, Nicolas Cuello, Christophe Pinte +13
We present 3D hydrodynamical models of the HD142527 protoplanetary disc, a bright and well studied disc that shows spirals and shadows in scattered light around a 100 au gas cavity…
Discovery of New Dipper Stars with K2: A Window into the Inner Disk Region of T Tauri Stars
Christina Hedges, Simon Hodgkin, Grant Kennedy
In recent years a new class of Young Stellar Object has been defined, referred to as dippers, where large transient drops in flux are observed. These dips are too large to be attri…
SUPERSHARP - Segmented Unfolding Primary for Exoplanet Research via Spectroscopic High Angular Resolution Photography
Ian Parry, Didier Queloz, Grant Kennedy +20
We propose to search for biosignatures in the spectra of reflected light from about 100 Earth-sized planets that are already known to be orbiting in their habitable zones (HZ). For…
ALMA observations of the narrow HR 4796A debris ring
Grant M. Kennedy, Sebastian Marino, Luca Matra +4
The young A0V star HR 4796A is host to a bright and narrow ring of dust, thought to originate in collisions between planetesimals within a belt analogous to the Solar System's Edge…