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An ALMA Survey of M-dwarfs in the Beta Pictoris Moving Group with Two New Debris Disc Detections
Patrick F. Cronin-Coltsmann, Grant M. Kennedy, Quentin Kral +4
Previous surveys in the far-infrared have found very few, if any, M-dwarf debris discs among their samples. It has been questioned whether M-dwarf discs are simply less common than…
The eclipse of the V773 Tau B circumbinary disk
M. A. Kenworthy, D. González Picos, E. Elizondo +9
A deep (~70%) and extended (~150 days) eclipse was seen towards the young multiple stellar system V773 Tau in 2010. We interpret it as due to the passage of a circumbinary disk aro…
The HD 98800 quadruple pre-main sequence system. Towards full orbital characterisation using long-baseline infrared interferometry
S. Zúñiga-Fernández, J. Olofsson, A. Bayo +8
HD 98800 is a young ( Myr old) and nearby ( pc) quadruple system, composed of two spectroscopic binaries orbiting around each other (AaAb and BaBb), with a gas-rich…
Highly structured inner planetary system debris around the intermediate age Sun-like star TYC 8830 410 1
Carl Melis, Johan Olofsson, Inseok Song +4
We present detailed characterization of the extremely dusty main sequence star TYC 8830 410 1. This system hosts inner planetary system dust (Tdust~300 K) with a fractional infrare…
Planet formation in intermediate-separation binary systems
O. Panić, T. J. Haworth, M. G. Petr-Gotzens +13
We report the first characterisation of the individual discs in the intermediate separation binary systems KK Oph and HD 144668 at millimetre wavelengths. In both systems the circu…
A low-mass stellar companion to the young variable star RZ Psc
Grant M. Kennedy, Christian Ginski, Matthew A. Kenworthy +10
RZ Psc is a young Sun-like star with a bright and warm infrared excess that is occasionally dimmed significantly by circumstellar dust structures. Optical depth arguments suggest t…
Herschel Observations of Disks around Late-type Stars
Angelle Tanner, Peter Plavchan, Geoff Bryden +9
A set of twenty late-type (K5-M5) stars were observed with the Herschel Space Observatory at 100 and 160 microns with the goal of searching for far-infrared excesses indicative of…
The HOSTS survey for exozodiacal dust: Observational results from the complete survey
Steve Ertel, Denis Defrère, Philip M. Hinz +43
The Large Binocular Telescope Interferometer (LBTI) enables nulling interferometric observations across the N band (8 to 13 um) to suppress a star's bright light and probe for fain…
Transiting exocomets detected in broadband light by TESS in the Pictoris system
Sebastian Zieba, Konstanze Zwintz, Matthew A. Kenworthy +1
We search for signs of falling evaporating bodies (FEBs, also known as exocomets) in photometric time series obtained for Pictoris after fitting and removing its Scuti type…
ISPY - the NaCo Imaging Survey for Planets around Young stars: A young companion candidate embedded in the R CrA cloud
G. Cugno, S. P. Quanz, R. Launhardt +13
Within the NaCo-ISPY exoplanet imaging program, we aim at detecting and characterizing the population of low-mass companions at wide separations (10AU), focusing in partic…
The PDS 110 observing campaign - photometric and spectroscopic observations reveal eclipses are aperiodic
Hugh P. Osborn, Matthew Kenworthy, Joseph E. Rodriguez +71
PDS 110 is a young disk-hosting star in the Orion OB1A association. Two dimming events of similar depth and duration were seen in 2008 (WASP) and 2011 (KELT), consistent with an ob…
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…
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}…
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…
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…
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…
Optical Polarimetry of KIC 8462852 in May-August 2017
I. A Steele, C. M. Copperwheat, H. E. Jermak +2
We present optical polarimetry in the period May-August 2017 of the enigmatic "dipping" star KIC 8462852. During that period three ~1% photometric dips were reported by other obser…
Extinction and the Dimming of KIC 8462852
Huan Y. A. Meng, George Rieke, Franky Dubois +11
To test alternative hypotheses for the behavior of KIC 8462852, we obtained measurements of the star over a wide wavelength range from the UV to the mid-infrared from October 2015…
SONS: The JCMT legacy survey of debris discs in the submillimetre
Wayne S. Holland, Brenda C. Matthews, Grant M. Kennedy +32
Debris discs are evidence of the ongoing destructive collisions between planetesimals, and their presence around stars also suggests that planets exist in these systems. In this pa…
The transiting dust clumps in the evolved disk of the Sun-like UXor RZ Psc
Grant M. Kennedy, Matthew A. Kenworthy, Joshua Pepper +4
RZ Psc is a young Sun-like star, long associated with the UXor class of variable stars, which is partially or wholly dimmed by dust clumps several times each year. The system has a…
ALMA Observations of the Debris Disk of Solar Analogue Tau Ceti
Meredith A. MacGregor, Samantha M. Lawler, David J. Wilner +4
We present 1.3 mm observations of the Sun-like star Ceti with the Atacama Large Millimeter/submillimeter Array (ALMA) that probe angular scales of '' (4 AU). This first…
The AU Mic Debris Disk: far-infrared and submillimeter resolved imaging
Brenda C. Matthews, Grant Kennedy, Bruce Sibthorpe +20
We present far-infrared and submillimeter maps from the Herschel Space Observatory and the James Clerk Maxwell Telescope of the debris disk host star AU Microscopii. Disk emission…