C. Thalmann
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The Eroding Disk of AU Mic Open
We report Hubble Space Telescope ( HST ) Space Telescope Imaging Spectrograph imaging of AU Mic’s debris disk from 2017 and archival data. Outward motion of the features in the southeast arm continues. At least three features have reached …
High-fidelity Imaging of the Inner AU Mic Debris Disk: Evidence of Differential Wind Sculpting? Open
ISSN:1967-2014
View article: Orbital Characterization of GJ1108A System, and Comparison of Dynamical Mass with Model-derived Mass for Resolved Binaries
Orbital Characterization of GJ1108A System, and Comparison of Dynamical Mass with Model-derived Mass for Resolved Binaries Open
We report an orbital characterization of GJ1108Aab that is a low-mass binary system in the pre-main-sequence phase. Via the combination of astrometry using adaptive optics and radial velocity measurements, an eccentric orbital solution of …
SPHERE / ZIMPOL high resolution polarimetric imager. I. System overview, PSF parameters, coronagraphy, and polarimetry Open
We describe the Zurich Imaging Polarimeter (ZIMPOL), the visual focal plane subsystem of the SPHERE "VLT planet finder", which pushes the limits of current AO systems to shorter wavelengths, higher spatial resolution, and much improved pol…
The Eroding Disk Of The Young M Star Au Mic Open
AU Mic (M1V, d=9.79 pc GAIA consortium 2016; t=24±3 Myr Bell et al. 2014) hosts a nearby debris disk. A distinctive feature is the presence of a series of arc-like structures on one side of the star. Comparison of SPHERE data from 2014 wit…
View article: Subaru/HiCIAO HK<sub>s</sub> Imaging of LKHa 330: Multi-band Detection of the Gap and Spiral-like Structures
Subaru/HiCIAO HK<sub>s</sub> Imaging of LKHa 330: Multi-band Detection of the Gap and Spiral-like Structures Open
We present H - and K s -bands observations of the LkH α 330 disk with a multi-band detection of the large gap and spiral-like structures. The morphology of the outer disk ( r ∼ 0.″3) at PA = 0°–45° and PA° = 180–290° is likely density wave…
SPOTS: The Search for Planets Orbiting Two Stars. III. Complete Sample and Statistical Analysis Open
Binary stars constitute a large percentage of the stellar population, yet relatively little is known about the planetary systems orbiting them. Most constraints on circumbinary planets (CBPs) so far come from transit observations with the …
View article: High-contrast Polarimetry Observation of the T Tau Circumstellar Environment
High-contrast Polarimetry Observation of the T Tau Circumstellar Environment Open
We conducted high-contrast polarimetry observations of T Tau in the H-band, using the High Contrast Instrument for the Subaru Next Generation Adaptive Optics instrument mounted on the Subaru Telescope, revealing structures as near as 0.″1 …
View article: The gravitational mass of Proxima Centauri measured with SPHERE from a microlensing event
The gravitational mass of Proxima Centauri measured with SPHERE from a microlensing event Open
Proxima Centauri, our closest stellar neighbour, is a low-mass M5 dwarf\norbiting in a triple system. An Earth-mass planet with an 11 day period has\nbeen discovered around this star. The star's mass has been estimated only\nindirectly usi…
View article: Observations of fast-moving features in the debris disk of AU Mic on a three-year timescale: Confirmation and new discoveries★★★
Observations of fast-moving features in the debris disk of AU Mic on a three-year timescale: Confirmation and new discoveries★★★ Open
Context. The nearby and young M star AU Mic is surrounded by a debris disk in which we previously identified a series of large-scale arch-like structures that have never been seen before in any other debris disk and that move outward at hi…
View article: Subaru/HiCIAO $HK_{\rm s}$ imaging of LkH$\alpha$ 330 - disk's color discussion and simultaneous detection of gap and spiral-like structures
Subaru/HiCIAO $HK_{\rm s}$ imaging of LkH$\alpha$ 330 - disk's color discussion and simultaneous detection of gap and spiral-like structures Open
We present $H$- and $K_{\rm s}$-bands observations of the LkH$\alpha$ 330 disk with a simultaneous detection of a large gap and spiral-like structures. The morphology of the outer disk ($r\sim$$0\farcs3$) at PA=0--45$^\circ$ and PA=180--29…
Resolving faint structures in the debris disk around TWA 7 Open
Context. Debris disks are the intrinsic by-products of the star and planet formation processes. Most likely due to instrumental limitations and their natural faintness, little is known about debris disks around low mass stars, especially w…
Resolving faint structures in the debris disk around TWA 7. Tentative detections of an outer belt, a spiral arm, and a dusty cloud Open
Context. Debris disks are the intrinsic by-products of the star and planet formation processes. Most likely due to instrumental limitations and their natural faintness, little is known about debris disks around low mass stars, especially w…
View article: The fundamental stellar parameters of FGK stars in the SEEDS survey Norman, OK 73071, USA
The fundamental stellar parameters of FGK stars in the SEEDS survey Norman, OK 73071, USA Open
Large exoplanet surveys have successfully detected thousands of exoplanets\nto-date. Utilizing these detections and non-detections to constrain our\nunderstanding of the formation and evolution of planetary systems also requires\na detaile…
View article: The Fundamental Stellar Parameters of FGK Stars in the SEEDS Survey
The Fundamental Stellar Parameters of FGK Stars in the SEEDS Survey Open
Large exoplanet surveys have successfully detected thousands of exoplanets to-date. Utilizing these detections and non-detections to constrain our understanding of the formation and evolution of planetary systems also requires a detailed u…
SPHERE/ZIMPOL observations of the symbiotic system R Aquarii. I. Imaging of the stellar binary and the innermost jet clouds Open
Context. R Aqr is a symbiotic binary system consisting of a mira variable, a hot companion with a spectacular jet outflow, and an extended emission line nebula. Because of its proximity to the Sun, this object has been studied in much deta…
The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits Open
Understanding the formation and evolution of giant planets (≥1 M Jup ) at wide orbital separation (≥5 AU) is one of the goals of direct imaging. Over the past 15 yr, many surveys have placed strong constraints on the occurrence rate of wid…
The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits. IV. Gravitational instability rarely forms wide, giant planets Open
Understanding the formation and evolution of giant planets ($\ge$1 $M_{Jup}$) at wide orbital separation ($\ge$5 AU) is one of the goals of direct imaging. Over the past 15 years, many surveys have placed strong constraints on the occurren…
SPHERE/ZIMPOL observations of the symbiotic system R Aquarii Open
Context. R Aqr is a symbiotic binary system consisting of a mira variable, a hot companion with a spectacular jet outflow, and an extended emission line nebula. Because of its proximity to the Sun, this object has been studied in much deta…
Testing giant planet formation in the transitional disk of SAO 206462 using deep VLT/SPHERE imaging Open
Context. The SAO 206462 (HD 135344B) disk is one of the few known transitional disks showing asymmetric features in scattered light and
\n thermal emission. Near-infrared scattered-light images revealed two bright outer spiral arms and an …
Near-infrared scattered light properties of the HR 4796 A dust ring. A measured scattering phase function from 13.6° to 166.6° Open
$\textit{Context}$. HR 4796 A is surrounded by a debris disc, observed in scattered light as an inclined ring with a high surface brightness. Past observations have raised several questions. First, a strong brightness asymmetry detected in…
The SEEDS High-Contrast Imaging Survey of Exoplanets Around Young Stellar Objects Open
We present high-contrast observations of 68 young stellar objects (YSOs) that have been explored as part of the Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS) survey on the Subaru telescope. Our targets are very young (<…
Near-infrared scattered light properties of the HR 4796 A dust ring Open
Context. HR 4796 A is surrounded by a debris disc, observed in scattered light as an inclined ring with a high surface brightness. Past observations have raised several questions. First, a strong brightness asymmetry detected in polarised …
SCExAO AND GPI<i>Y</i><i>JH</i>BAND PHOTOMETRY AND INTEGRAL FIELD SPECTROSCOPY OF THE YOUNG BROWN DWARF COMPANION TO HD 1160 Open
We present high signal-to-noise ratio, precise $YJH$ photometry and $Y$ band\n(\\gpiwave~$\\mu$m) spectroscopy of HD 1160 B, a young substellar companion\ndiscovered from the Gemini NICI Planet Finding Campaign, using the Subaru\nCoronagra…
Near-infrared scattered light properties of the HR4796A dust ring: a measured scattering phase function from 13.6deg to 166.6deg Open
HR4796A is surrounded by a debris disc, observed in scattered light as an inclined ring. Past observations raised several questions. First, a strong brightness asymmetry detected in polarized reflected light recently challenged our underst…
Three Years of SPHERE: The Latest View of the Morphology and Evolution of Protoplanetary Discs Open
Spatially resolving the immediate surroundings of young stars is a key challenge for the planet formation community. SPHERE on the VLT represents an important step forward by increasing the opportunities offered by optical or near-infrared…
NEAR-INFRARED IMAGING POLARIMETRY OF INNER REGION OF GG TAU A DISK Open
By performing non-masked polarization imaging with Subaru/HiCIAO, polarized scattered light from the inner region of the disk around the GG Tau A system was successfully detected in the H band, with a spatial resolution of approximately 0.…
View article: SPIRAL STRUCTURE AND DIFFERENTIAL DUST SIZE DISTRIBUTION IN THE LkHα 330 DISK
SPIRAL STRUCTURE AND DIFFERENTIAL DUST SIZE DISTRIBUTION IN THE LkHα 330 DISK Open
Dust trapping accelerates the coagulation of dust particles, and, thus, it represents an initial step toward the formation of planetesimals. We report H -band (1.6 μ m) linear polarimetric observations and 0.87 mm interferometric continuum…
Upper limits for mass and radius of objects around Proxima Cen from SPHERE/VLT Open
The recent discovery of an earth-like planet around Proxima Centauri has drawn much attention to this star and its environment. We performed a series of observations of Proxima Centauri using Spectro-Polarimetric High-contrast Exoplanet RE…
Shadows cast on the transition disk of HD 135344B Open
Context. The protoplanetary disk around the F-type star HD 135344B (SAO 206462) is in a transition stage and shows many intriguing structures both in scattered light and thermal (sub-) millimeter emission which are possibly related to plan…