The circumstellar disks of Beta Pictoris analogs

AbstractFor life to develop, planets are a necessary condition. Likewise, for planets to form, stars must be surrounded by circumstellar disks, at least some time during their pre-main sequence evolution. Much progress has been made recently in the study of young solar-like stars. In the optical domain, these stars are known as «T Tauri stars». A significant number show IR excess, and other phenomena indirectly suggesting the presence of circumstellar disks. The current wisdom is that there is an evolutionary sequence from protostars to T Tauri stars. This sequence is characterized by the initial presence of disks, with lifetimes ~ 1-10 Myr after the intial collapse of a dense envelope having given birth to a star. While they are present, about 30% of the disks have masses larger than the minimum solar nebula. Their disappearance may correspond to the growth of dust grains, followed by planetesimal and planet formation, but this is not yet demonstrated.

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STRUCTURE AND EVOLUTION OF PRE-MAIN-SEQUENCE CIRCUMSTELLAR DISKS

The Astrophysical Journal ◽

10.1088/0004-637x/701/1/260 ◽

2009 ◽

Vol 701 (1) ◽

pp. 260-282 ◽

Cited By ~ 211

Author(s):

Andrea Isella ◽

John M. Carpenter ◽

Anneila I. Sargent

Keyword(s):

Main Sequence ◽

Circumstellar Disks

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TESTING THE HYPOTHESIS THAT METHANOL MASER RINGS TRACE CIRCUMSTELLAR DISKS: HIGH-RESOLUTION NEAR-INFRARED AND MID-INFRARED IMAGING

The Astrophysical Journal ◽

10.1088/0004-637x/754/2/149 ◽

2012 ◽

Vol 754 (2) ◽

pp. 149 ◽

Cited By ~ 12

Author(s):

James M. De Buizer ◽

Anna Bartkiewicz ◽

Marian Szymczak

Keyword(s):

High Resolution ◽

Near Infrared ◽

Infrared Imaging ◽

Circumstellar Disks ◽

Mid Infrared ◽

Methanol Maser

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A Circumstellar Disk Around beta Pictoris

Science ◽

10.1126/science.226.4681.1421 ◽

1984 ◽

Vol 226 (4681) ◽

pp. 1421-1424 ◽

Cited By ~ 476

Author(s):

B. A. SMITH ◽

R. J. TERRILE

Keyword(s):

Circumstellar Disk ◽

Beta Pictoris

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L-band search for substellar companions in the Tucana and $\beta$ Pictoris moving groups

Proceedings of the International Astronomical Union ◽

10.1017/s1743921306009276 ◽

2005 ◽

Vol 1 (C200) ◽

pp. 175-180

Author(s):

M. Kasper ◽

D. Apai ◽

W. Brandner ◽

L.M. Close ◽

K. Geißler

Keyword(s):

Beta Pictoris ◽

L Band ◽

Substellar Companions ◽

Moving Groups

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IPHAS A-type Stars with Mid-IR Excesses in Spitzer Surveys

Proceedings of the International Astronomical Union ◽

10.1017/s1743921310011932 ◽

2009 ◽

Vol 5 (H15) ◽

pp. 815-815

Author(s):

Antonio S. Hales ◽

Michael J. Barlow ◽

Janet E. Drew ◽

Yvonne C. Unruh ◽

Robert Greimel ◽

...

Keyword(s):

Cross Correlation ◽

Main Sequence ◽

Terrestrial Planet ◽

Circumstellar Disks ◽

Main Sequence Stars ◽

Intermediate Mass ◽

Mid Infrared ◽

Isaac Newton ◽

Intermediate Mass Stars ◽

Dust Disks

AbstractThe Isaac Newton Photometric H-Alpha Survey (IPHAS) provides (r′-Hα)-(r′-i′) colors, which can be used to select AV0-5 Main Sequence star candidates (age~20-200 Myr). By combining a sample of 23050 IPHAS-selected A-type stars with 2MASS, GLIMPSE and MIPSGAL photometry we searched for mid-infrared excesses attributable to dusty circumstellar disks. Positional cross-correlation yielded a sample of 2692 A-type stars, of which 0.6% were found to have 8-μm excesses above the expected photospheric values. The low fraction of main sequence stars with mid-IR excesses found in this work indicates that dust disks in the terrestrial planet zone of Main Sequence intermediate mass stars are rare. Dissipation mechanisms such as photo-evaporation, grain growth, collisional grinding or planet formation could possibly explain the depletion of dust detected in the inner regions of these disks.

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Tracing planet-induced structures in circumstellar disks using molecular lines

Astronomy and Astrophysics ◽

10.1051/0004-6361/201526117 ◽

2015 ◽

Vol 579 ◽

pp. A105 ◽

Cited By ~ 19

Author(s):

F. Ober ◽

S. Wolf ◽

A. L. Uribe ◽

H. H. Klahr

Keyword(s):

Circumstellar Disks ◽

Molecular Lines

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Extreme Adaptive Optics

Annual Review of Astronomy and Astrophysics ◽

10.1146/annurev-astro-081817-052000 ◽

2018 ◽

Vol 56 (1) ◽

pp. 315-355 ◽

Cited By ~ 16

Author(s):

Olivier Guyon

Keyword(s):

Adaptive Optics ◽

Thermal Emission ◽

Contrast Ratio ◽

Angular Separation ◽

Circumstellar Disks ◽

Spectroscopic Characterization ◽

Central Star ◽

High Contrast ◽

Direct Imaging ◽

Segmented Mirror

Over the last two decades, several thousand exoplanets have been identified, and their study has become a high scientific priority. Direct imaging of nearby exoplanets and the circumstellar disks in which they form and evolve is challenging due to the high contrast ratio and small angular separation relative to the central star. Exoplanets are typically within 1 arcsec of, and between 4 and 10 orders of magnitude fainter than, the stars they orbit. To meet these challenges, ground-based telescopes must be equipped with extreme adaptive optics (ExAO) systems optimized to acquire high-contrast images of the immediate surrounding of nearby bright stars. Current ExAO systems have the sensitivity to image thermal emission from young massive planets in near-IR, while future systems deployed on Giant Segmented Mirror Telescopes will image starlight reflected by lower-mass rocky planets. Thanks to rapid progress in optical coronagraphy, wavefront control, and data analysis techniques, direct imaging and spectroscopic characterization of habitable exoplanets will be within reach of the next generation of large ground-based telescopes.

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