Multi-wavelength studies of protoplanetary disks [Elektronische Ressource] / presented by Veronica Roccatagliata

Sujets

• Astronomie

Informations

• Publié par: ruprecht-karls-universitat_heidelberg
• Publié le: 01 janvier 2010
• Nombre de lectures: 21
• Langue: English
• Poids de l'ouvrage: 3 Mo

Extrait

Multi-wavelength studies of
protoplanetary discs
Veronica Roccatagliata
Max-Planck-Institut fu¨r Astronomie
Heidelberg 2010Dissertation in Astronomy
submitted to the
Combined Faculties for the Natural Sciences and for Mathematics
of the Ruperto-Carola University of Heidelberg, Germany.
for the degree of
Doctor of Natural Sciences
presented by
Dipl.-Phys. Veronica Roccatagliata
born in Venezia, Italy
Oral examination: 28. 04. 2010Multi-wavelength studies of
protoplanetary discs
Referees: Prof. Dr. Thomas Henning
Prof. Dr. Sebastian WolfThis thesis is dedicated
to Davide, Giovanni & ElenaContents
1 Introduction 5
1.1 Disc evolution . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Debris disc phase . . . . . . . . . . . . . . . . . . . . . . 11
1.3 About this thesis . . . . . . . . . . . . . . . . . . . . . . 12
2 Multi-wavelength observations of the young binary system
Haro 6-10 15
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2 Observations. . . . . . . . . . . . . . . . . . . . . . . . . 18
2.2.1 Archival Optical and Near-infrared images . . . . 18
2.2.2 TIMMI2 infrared spectra . . . . . . . . . . . . . . 18
2.2.3 MIDI/VLTI observations . . . . . . . . . . . . . . 19
2.3 Data reduction and results . . . . . . . . . . . . . . . . . 19
2.3.1 Optical HST photometry . . . . . . . . . . . . . . 19
2.3.2 Near-infrared photometry with NACO. . . . . . . 20
2.3.3 TIMMI2 mid-infrared spectroscopy . . . . . . . . 20
2.3.4 MIDI visibility . . . . . . . . . . . . . . . . . . . 21
2.3.5 MIDI spectroscopy . . . . . . . . . . . . . . . . . 22
2.3.6 Correlated flux . . . . . . . . . . . . . . . . . . . 22
2.4 Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.4.1 Large-scale morphology in the optical and near in-
frared . . . . . . . . . . . . . . . . . . . . . . . . 23
2.4.2 Optical extinction . . . . . . . . . . . . . . . . . . 24
2.4.3 Small-scale morphology: Geometry of the discs . 25
2.5 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.6 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.7 Appendix: Spectral Energy Distribution . . . . . . . . . 30
3 Disc Evolution in OB Associations: the case of IC 1795 45
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 45vi Contents
3.2 Observations and data reduction . . . . . . . . . . . . . . 47
3.2.1 IRAC observations . . . . . . . . . . . . . . . . . 47
3.2.2 IRAC photometry. . . . . . . . . . . . . . . . . . 47
3.2.3 ACIS observations . . . . . . . . . . . . . . . . . 48
3.2.4 Near-infrared and optical surveys of IC 1795 . . . 49
3.3 The IRAC point source catalog . . . . . . . . . . . . . . 50
3.3.1 Positions of the IRAC sources . . . . . . . . . . . 50
3.3.2 Photometry of the IRAC sources . . . . . . . . . 51
3.4 Cluster membership . . . . . . . . . . . . . . . . . . . . . 52
3.4.1 Cluster membership based on X-ray detection . . 53
3.4.2 X-ray contamination . . . . . . . . . . . . . . . . 54
3.4.3 Cluster member candidates and IR contamination 55
3.4.4 Infrared colour-colour and colour-Magnitude Dia-
grams of the cluster members. . . . . . . . . . . . 55
3.5 Age and Mass Distribution of the cluster members . . . . 55
3.5.1 Age of the cluster . . . . . . . . . . . . . . . . . . 56
3.5.2 Luminosity and Mass Functions of IC 1795 . . . . 57
3.6 Disc evolution: effect of the stellar mass and the environ-
ment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
3.6.1 Disc fraction vs stellar mass and spatial distribution 58
3.6.2 Influence of the O star in the cluster: disc photo-
evaporation and cluster dynamics . . . . . . . . . 60
3.6.3 Disc evolution . . . . . . . . . . . . . . . . . . . . 62
3.7 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3.8 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . 64
3.8.1 Evolutionary model . . . . . . . . . . . . . . . . . 64
3.8.2 Disc fraction in the [[3.6],[3.6]-[4.5]] CMD . . . . . 65
3.8.3 Relationbetween3.6μmIRACmagnitudeandstel-
lar mass . . . . . . . . . . . . . . . . . . . . . . . 66
4 Long-wavelength observations of debris discs around sun-like
stars 125
4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 125
4.2 Observations. . . . . . . . . . . . . . . . . . . . . . . . . 127
4.2.1 Sample . . . . . . . . . . . . . . . . . . . . . . . . 127
4.2.2 CSO observations at 350 μm . . . . . . . . . . . . 128
4.2.3 IRAM observations at 1.2 mm . . . . . . . . . . . 128
4.2.4 Detections and upper limits . . . . . . . . . . . . 129