Explanipedia

The Ophiuchus DIsk Survey Employing ALMA (ODISEA): A Unified Evolutionary Sequence of Planet-driven Substructures Explaining the Diversity of Disk Morphologies Open

Santiago Orcajo, Lucas A. Cieza, O. M. Guilera, Sebastián Pérez, Fernando R. Rannou , et al. · 2025

Understanding the origin of substructures in protoplanetary disks and their connection to planet formation is currently one of the main challenges in astrophysics. While some disks appear smooth, most exhibit diverse substructures such as …

The SPHERE infrared survey for exoplanets (SHINE) Open

A. Chomez, P. Delorme, A. M. Lagrange, R. Gratton, Olivier Flasseur , et al. · 2025

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 e…

The Ophiuchus DIsk Survey Employing ALMA (ODISEA): Complete Size Distributions for the 100 Brightest Disks across Multiplicity and Spectral Energy Distribution Classes Open

A. Dasgupta, Lucas A. Cieza, Camilo González-Ruilova, T. Bhowmik, Prachi Chavan , et al. · 2025

The size of a protoplanetary disk is a fundamental property, yet most remain unresolved, even in nearby star-forming regions ( d ∼ 140–200 pc). We present the complete continuum size distribution for the 105 brightest protoplanetary disks …

The Ophiuchus DIsk Survey Employing ALMA (ODISEA): Complete Size Distributions for the 100 Brightest Disks Across Multiplicity and SED Classes Open

Arnab Dasgupta, Lucas A. Cieza, Camilo I. Gonzalez Ruilova, T. Bhowmik, Ms. Prachi Chavan , et al. · 2025

The size of a protoplanetary disk is a fundamental property, yet most remain unresolved, even in nearby star-forming regions (d $\sim$ 140-200 pc). We present the complete continuum size distribution for the $105$ brightest protoplanetary …

The SPHERE infrared survey for exoplanets (SHINE). V. Complete observations, data reduction and analysis, detection performances, and final results Open

A. Chomez, P. Delorme, A.‐M. Lagrange, R. Gratton, Olivier Flasseur , et al. · 2025

During the past decade, state-of-the-art planet-finder instruments like SPHERE@VLT, coupling coronagraphic devices and extreme adaptive optics systems, unveiled, thanks to large surveys, around 20 planetary mass companions at semi-major ax…

Variable circularly polarized radio emission from the young stellar object [BHB2007]-1: Another ingredient of a unique system Open

Simranpreet Kaur, J. M. Girart, Daniele Viganò, Á. Sánchez-Monge, L. Ilsedore Cleeves , et al. · 2024

The young stellar object [BHB2007]-1 has been extensively studied in the past at radio, millimeter, and infrared wavelengths. It has revealed a gap in the disk and previous observations have claimed possible emission from a sub-stellar obj…

Astrometric and photometric characterization of <i>η</i> Tel B combining two decades of observations Open

Pedro H. Nogueira, C. Lazzoni, A. Zurlo, T. Bhowmik, C. Donoso-Oliva , et al. · 2024

Context . η Tel is an 18 Myr system composed of a 2.09 M ⊙ A-type star with an M7-M8 brown dwarf companion, η Tel B. The two objects have a projected separation of 4″.2 (~208 au). This system has been targeted by high-contrast imaging camp…

Azimuthal temperature variations in ISO-Oph 2 from multifrequency ALMA observations Open

Simón Casassus, Lucas A. Cieza, Miguel Cárcamo, Álvaro Ribas, Valentin Christiaens , et al. · 2023

Environmental effects, such as stellar fly-bys and external irradiation, are thought to affect the evolution of protoplanetary discs in clustered star formation. Previous Atacama Large Millimetre/submillimetre Array (ALMA) images at 225 GH…

Azimuthal temperature variations in ISO-Oph2 from multi-frequency ALMA observations Open

Simón Casassus, Lucas A. Cieza, Miguel Cárcamo, Álvaro Ribas, Valentin Christiaens , et al. · 2023

Environmental effects, such as stellar fly-bys and external irradiation, are thought to affect the evolution of protoplanetary disks in clustered star formation. Previous ALMA images at 225 GHz of the ISO-Oph 2 binary revealed a peculiar m…

Resolving the binary components of the outbursting protostar HBC 494 with ALMA Open

Pedro H. Nogueira, A. Zurlo, Sebastián Pérez, Camilo González-Ruilova, Lucas A. Cieza , et al. · 2023

Episodic accretion is a low-mass pre-main sequence phenomenon characterized by sudden outbursts of enhanced accretion. These objects are classified into two: protostars with elevated levels of accretion that lasts for decades or more, call…

Resolving the Binary Components of the Outbursting Protostar HBC 494 with ALMA Open

Pedro H. Nogueira, A. Zurlo, Sebastián Pérez, Camilo González-Ruilova, Lucas A. Cieza , et al. · 2023

Episodic accretion is a low-mass pre-main sequence phenomenon characterized by sudden outbursts of enhanced accretion. These objects are classified into two: protostars with elevated levels of accretion that lasts for decades or more, call…

The high-albedo, low polarization disk around HD 114082 that harbors a Jupiter-sized transiting planet Open

N. Engler, J. Milli, R. Gratton, Solène Ulmer-Moll, A. Vigan , et al. · 2023

Aims. We present new optical and near-infrared images of the debris disk around the F-type star HD 114082 in the Scorpius-Centaurus OB association. We obtained direct imaging observations and analyzed the TESS photometric time series data …

The high-albedo, low polarization disk around HD 114082 harbouring a Jupiter-sized transiting planet Open

N. Engler, J. Milli, R. Gratton, S. Ulmer-Moll, A. Vigan , et al. · 2022

We present new optical and near-IR images of debris disk around the F-type star HD 114082. We obtained direct imaging observations and analysed the TESS photometric time series data of this target with a goal to search for planetary compan…

Orbital and dynamical analysis of the system around HR 8799. New astrometric epochs from VLT/SPHERE and LBT/LUCI Open

A. Zurlo, K. Gozdziewski, C. Lazzoni, Pedro H. Nogueira, S. Desidera , et al. · 2022

HR\,8799 is a young planetary system composed of 4 planets and a double debris belt. Being the first multi-planetary system discovered with the direct imaging technique, it has been observed extensively since 1998. This wide baseline of as…

Orbital and dynamical analysis of the system around HR 8799 Open

A. Zurlo, Krzysztof Goździewski, C. Lazzoni, D. Mesa, Pedro H. Nogueira , et al. · 2022

Context. HR 8799 is a young planetary system composed of four planets and a double debris belt. Being the first multi-planetary system discovered with the direct imaging technique, it has been observed extensively since 1998. This wide bas…

Revealing asymmetrical dust distribution in the inner regions of HD 141569 Open

Garima Singh, T. Bhowmik, A. Boccaletti, P. Thébault, Quentin Kral , et al. · 2021

We obtained polarimetric differential imaging of a gas-rich debris disk around HD 141569A with SPHERE in the H-band to compare the scattering properties of the innermost ring at 44 au with former observations in total intensity with the sa…

Revealing asymmetrical dust distribution in the inner regions of HD 141569 Open

Garima Singh, T. Bhowmik, A. Boccaletti, P. Thébault, Quentin Kral , et al. · 2021

Context. The combination of high-contrast imaging with spectroscopy and polarimetry offers a pathway to studying the grain distribution and properties of debris disks in exquisite detail. Here, we focus on the case of a gas-rich debris dis…

The SPHERE infrared survey for exoplanets (SHINE): II. Observations, data reduction and analysis, detection performances, and initial results Open

M. Langlois, R. Gratton, A.‐M. Lagrange, P. Delorme, A. Boccaletti , et al. · 2021

Context. In recent decades, direct imaging has confirmed the existence of substellar companions (exoplanets or brown dwarfs) on wide orbits (>10 au) around their host stars. In striving to understand their formation and evolution mechanism…

The SPHERE infrared survey for exoplanets (SHINE) Open

M. Langlois, R. Gratton, A.‐M. Lagrange, P. Delorme, A. Boccaletti , et al. · 2021

Context. In recent decades, direct imaging has confirmed the existence of substellar companions (exoplanets or brown dwarfs) on wide orbits (>10 au) around their host stars. In striving to understand their formation and evolution mechanism…

Orbital and spectral characterization of the benchmark T-type brown dwarf HD 19467B Open

A.-L. Maire, Karan Molaverdikhani, S. Desidera, Trifon Trifonov, P. Mollière , et al. · 2020

\nContext. Detecting and characterizing substellar companions for which the luminosity, mass, and age can be determined independently is of utter importance to test and calibrate the evolutionary models due to uncertainties in their format…

Resolved spectroscopy of debris disks with SPHERE/VLT Open

T. Bhowmik · 2020

Debris disks are characterized by the dusty, gas-depleted environment bearing non-primordial dust grains which are constantly generated by continuous collisions between planetesimals. High-contrast imaging in the near-infrared allows to me…

Spectroscopie résolue de disques debris avec SPHERE/VLT Open

T. Bhowmik · 2019

Les disques de débris sont présents autour de nombreuses jeunes étoiles de la séquence principale. Ils se caractérisent par un environnement poussiéreux, dépourvu de gaz, par opposition à des disques protoplanétaires riches en gaz. Les dis…

Spatially resolved spectroscopy of the debris disk HD 32297 Open

T. Bhowmik, A. Boccaletti, P. Thébault, Quentin Kral, Johan Mazoyer , et al. · 2019

Context. Spectro-photometry of debris disks in total intensity and polarimetry can provide new insight into the properties of the dust grains therein (size distribution and optical properties). Aims. We aim to constrain the morphology of t…

Spatially resolved spectroscopy of the debris disk HD 32297: Further evidence of small dust grains Open

T. Bhowmik, A. Boccaletti, P. Thébault, Quentin Kral, Johan Mazoyer , et al. · 2019

Spectro-photometry of debris disks in total intensity and polarimetry can provide new insight into the properties of the dust grains therein (size distribution and optical properties). We aim to constrain the morphology of the highly incli…

Two cold belts in the debris disk around the G-type star NZ Lupi Open

A. Boccaletti, P. Thébault, Nicole Pawellek, A.‐M. Lagrange, R. Galicher , et al. · 2019

Context. Planetary systems hold the imprint of the formation and of the evolution of planets especially at young ages, and in particular at the stage when the gas has dissipated leaving mostly secondary dust grains. The dynamical perturbat…

SPHERE dynamical and spectroscopic characterization of HD 142527B Open

R. Claudi, A.-L. Maire, D. Mesa, A. Cheetham, C. Fontanive , et al. · 2018

Aims. HD 142527 is one of the most frequently studied Herbig Ae/Be stars with a transitional disk that hosts a large cavity that is up to about 100 au in radius. For this reason, it has been included in the guaranteed time observation (GTO…

Imaging radial velocity planets with SPHERE Open

A. Zurlo, D. Mesa, S. Desidera, S. Messina, R. Gratton , et al. · 2018

We present observations with the planet finder SPHERE of a selected sample of\nthe most promising radial velocity (RV) companions for high-contrast imaging.\nUsing a Monte Carlo simulation to explore all the possible inclinations of the\no…

New disk discovered with VLT/SPHERE around the M star GSC 07396−00759 Open

E. Sissa, J. Olofsson, A. Vigan, J.‐C. Augereau, V. D’Orazi , et al. · 2018

Debris disks are usually detected through the infrared excess over the photospheric level of their host star. The most favorable stars for disk detection are those with spectral types between A and K, while the statistics for debris disks …

Investigating the young solar system analog HD 95086 Open

G. Chauvin, R. Gratton, M. Bonnefoy, A.-M. Lagrange, J. de Boer , et al. · 2018

Context. HD 95086 (A8V, 17 Myr) hosts a rare planetary system for which a multi-belt debris disk and a giant planet of 4–5 M Jup have been directly imaged. Aims. Our study aims to characterize the global architecture of this young system u…

Investigating the young Solar System analog HD95086 Open

G. Chauvin, R. Gratton, M. Bonnefoy, M. Janson, J. de Boer , et al. · 2018

HD95086 (A8V, 17Myr) hosts a rare planetary system for which a multi-belt debris disk and a giant planet of 4-5MJup have been directly imaged. Our study aims to characterize the physical and orbital properties of HD95086b, search for addit…

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