Z. Wahhaj

LkCa 15 polarimetric images

Swastik C, Z. Wahhaj, M. Benisty, Arora S et autres

in, it, cl, fr, de, ie, jp (code pays fourni par la source)

The Companions to B and A Stars Snapshot (C-BASS) Survey. I. Discovery of a Young Brown Dwarf Companion to HIP 17453

Marah Brinjikji, Adam J. R. W. Smith, J. Patience, E. Nielsen et autres

Abstract We report the detection of a new brown dwarf companion to HIP 17453 A, a chemically peculiar A0V star located at a distance of 81 pc. HIP 17453 A was observed with high-resolution adaptive-optics imaging using the Near-Infrared Camera 2 on …

us, gb, ca (code pays fourni par la source)

The Companions to B and A Stars Snapshot (C-BASS) Survey: I. Discovery of a Young Brown Dwarf Companion to HIP 17453

Marah Brinjikji, A T Smith, J. Patience, Eric Nielsen et autres

We report the detection of a new brown dwarf companion to HIP 17453 A, a chemically peculiar A0V star located at a distance of 81 pc. HIP 17453 A was observed with high-resolution adaptive optics imaging using the Near-Infrared Camera 2 on …

The Companions to B and A Stars Snapshot (C-BASS) Survey: I. Discovery of a Young Brown Dwarf Companion to HIP 17453

Marah Brinjikji, A T Smith, J. Patience, Eric Nielsen et autres

We report the detection of a new brown dwarf companion to HIP 17453 A, a chemically peculiar A0V star located at a distance of 81 pc. HIP 17453 A was observed with high-resolution adaptive optics imaging using the Near-Infrared Camera 2 on …

Imaging the LkCa 15 system in polarimetry and total intensity without self-subtraction artefacts

C. Swastik, Z. Wahhaj, M. Benisty, Saksham Arora et autres

Context . Studying young proto-planetary discs is essential for understanding planet formation, but traditional angular differential imaging introduces self-subtraction artefacts that make their small-scale structure difficult to interpret. We present high-resolution total- and polarised-intensity K s -band images of the LkCa 15 …

in, it, fr, de, ie, au, jp (code pays fourni par la source)

Imaging the LkCa 15 system in polarimetry and total intensity without self-subtraction artefacts

C. Swastik, Z. Wahhaj, M. Benisty, Saksham Arora et autres

Studying young protoplanetary disks is essential for understanding planet formation, but traditional angular differential imaging can introduce self-subtraction artefacts that hinder interpretation of small-scale structures. We present high-resolution total- and polarized-intensity Ks-band images of the LkCa~15 system obtained with SPHERE using near-simultaneous …

Imaging the LkCa 15 system in polarimetry and total intensity without self-subtraction artefacts

C. Swastik, Z. Wahhaj, M. Benisty, Saksham Arora et autres

Studying young protoplanetary disks is essential for understanding planet formation, but traditional angular differential imaging can introduce self-subtraction artefacts that hinder interpretation of small-scale structures. We present high-resolution total- and polarized-intensity Ks-band images of the LkCa~15 system obtained with SPHERE using near-simultaneous …

Coherent differential imaging of high-contrast extended sources with VLT/SPHERE

Axel Potier, Raphaël Galicher, Pierre Baudoz, Johan Mazoyer et autres

Context. High-contrast imaging relies on advanced coronagraphs and adaptive optics (AO) to attenuate the starlight. However, residual aberrations, especially non-common path aberrations between the AO channel and the coronagraph channel, limit the instrument performance. While post-processing techniques such as spectral or angular …

fr, cl, md, de (code pays fourni par la source)

Coherent differential imaging of high-contrast extended sources with VLT/SPHERE

Axel Potier, R. Galicher, Pierre Baudoz, Johan Mazoyer et autres

Context . High-contrast imaging relies on advanced coronagraphs and adaptive optics (AO) to attenuate the starlight. However, residual aberrations, especially non-common path aberrations between the AO channel and the coronagraph channel, limit the instrument performance. While post-processing techniques such as spectral or …

fr, cl, us, de (code pays fourni par la source)

Early Results from VLT-SPHERE: Long-Slit Spectroscopy of 2MASS 0122-2439B, a Young Companion Near the Deuterium Burning Limit

Sasha Hinkley, Brendan P. Bowler, A. Vigan, Dimitri Mawet et autres

We present 0.95–1.80 µm spectroscopy of the ∼12–27 MJup companion orbiting the faint (R∼13.6), young (∼120Myr) M-dwarf 2MASS J01225093–2439505 (“2M0122–2439B”) at 1.′′5 separation (50 AU). Our coronagraphic long-slit spectroscopy was obtained with the new high contrast imaging platform VLT-SPHERE during Science Verification. …

gb, us, fr, cl (code pays fourni par la source)

Protoplanetary disks unveiled by star-hopping: Total intensity, polarimetry, and millimeter imaging modeled in concert

Z. Wahhaj

Context. Angular differential imaging (ADI), widely used in ground-based high-contrast imaging, often distorts extended emission such as protoplanetary disks. This hampers efforts to jointly study circumstellar disks and embedded protoplanets, particularly in systems like PDS 70, Lk Ca 15, and HD 163296, …

cl (code pays fourni par la source)

The SPHERE infrared survey for exoplanets (SHINE)

A. Chomez, P. Delorme, A. M. Lagrange, R. Gratton et autres

Context. Over the past decade, large surveys with state-of-the-art planet-finder instruments such as Spectro-Polarimetric High-contrast Exoplanet REsearch on board Very Large Telescope (SPHERE@VLT), coupled with coronagraphic devices and extreme adaptive optics (AO) systems, have unveiled around 20 planetary mass companions at a …

fr, it, cl, de, ch, us, ie, nl, gb, se (code pays fourni par la source)