sess 4 solano

Information about sess 4 solano

Published on June 18, 2007

Author: Techy_Guy

Source: authorstream.com

Content

Brown dwarfs and star forming regions in the framework of the Virtual Observatory.:  Brown dwarfs and star forming regions in the framework of the Virtual Observatory. Enrique Solano, LAEFF / SVO Eduardo Martín, IAC / SVO Network J. A. Caballero, MPI / SVO Network Introduction: BDs and VO. Discovery of new candidates (field andamp; SFR). Characterization of SFR Testing the BD formation theories. The search for the rare:  The search for the rare The advances in technology (large-scale detector arrays, computing capability, highly automated pipelines and analysis software,…) have undergone an explosion of productivity in the search for rare objects through large-area surveys. From the brightest and most distant quasars (e.g Fan et al. 2004)… … to the faintest and nearest stars and brown dwarfs (e.g. Burgasser et al. 2002) The Virtual Observatory goes a step ahead offering The possibility of joining these large data sets The development of tools to facilitate the efficient analysis of the contents. Brown dwarfs:  Brown dwarfs Represent a class of objects linking the properties of observable low-mass stars and BD with the properties of unobservable extrasolar-planets. Brown dwarfs: detection methods:  Brown dwarfs: detection methods Most of them have been identified using Large-area, optical and near-IR surveys Color criteria 2MASS SDSS DENIS BDs discovered using VO:  BDs discovered using VO However, systematic searches using a VO methodology have not been performed so far. Brown dwarfs and star forming regions in the framework of the Virtual Observatory.:  Brown dwarfs and star forming regions in the framework of the Virtual Observatory. Enrique Solano, LAEFF / SVO Eduardo Martín, IAC / SVO Network J. A. Caballero, MPI / SVO Network Introduction: BDs and VO. Discovery of new candidates (field andamp; SFR). Characterization of SFR Testing the BD formation theories. I.- Discovering field BDs with 2MASS/DENIS/SDSS … :  I.- Discovering field BDs with 2MASS/DENIS/SDSS … DENIS, 2MASS, SDSS/DR5: Millions of objects and still new releases to come. (SDSS/DR5 a few months ago). 'The South also exists': most of the T dwarfs were discovered using 2MASS / SDSS  DENIS exploitation. Good astrometric (0'.5arcsec) and photometry accuracy. 2MASS/J 10σ-limit: 15.8 DENIS/J 3σ-limit: 16.5 2 andlt; (z-J) andlt; 4 SDSS/z limit: 20.4  The nearby T dwarf population can be detected. Simulations predict 12 L and 21 T dwarfs within the 10 pc horizon, more than twice the number so far identified. …using a VO methodology:  …using a VO methodology Discovering field BDs with 2MASS/SDSS :  Discovering field BDs with 2MASS/SDSS Region surveyed: RA: 300° – 360° / DEC: 0° – 20° Three potential candidates, one of them already identified as BD (2004, AJ, 127, 3553) Follow-up (IR imaging) foreseen for the coming weeks. Discovering field BDs with 2MASS/DENIS Region surveyed: RA: 300° – 360° / DEC: -10° / -34° RA: 210° – 270° / DEC: -1° / -13° 10+8 potential candidates Follow-up (IR imaging) already done. Analysis on-going. What’s next?:  What’s next? UKIDSS (II):  UKIDSS (II) z (SDSS) limiting magnitude: 20.4 J (2MASS) limiting magnitude: 15.8 Faint SDSS sources do not have 2MASS counterparts. The discovery of brown dwarfs cooler than T dwarfs (the 'Y' dwarfs) is one of the key science drivers for UKIDSS. Brown dwarfs and star forming regions in the framework of the Virtual Observatory.:  Brown dwarfs and star forming regions in the framework of the Virtual Observatory. Enrique Solano, LAEFF / SVO Eduardo Martín, IAC / SVO Network J. A. Caballero, MPI / SVO Network Introduction: BDs and VO. Discovery of new candidates (field andamp; SFR). Characterization of SFR Testing the BD formation theories. II.- Characterization of SFRs:  II.- Characterization of SFRs Characterization of SFRs (II):  Characterization of SFRs (II) Jumping to the substellar regime: From 3 to 0.05 solar masses 2MASS / DENIS correlation. 30 arcmin search radius. Selection criteria based on well-known cluster members. On-going: Similar analysis for all the clusters of the Orion belt. Brown dwarfs and star forming regions in the framework of the Virtual Observatory.:  Brown dwarfs and star forming regions in the framework of the Virtual Observatory. Enrique Solano, LAEFF / SVO Eduardo Martín, IAC / SVO Network J. A. Caballero, MPI / SVO Network Introduction: BDs and VO. Discovery of new candidates (field andamp; SFR). Characterization of SFR Testing the BD formation theories. Testing the BD formation theories:  Testing the BD formation theories The way how BDs are formed is still a matter of debate. Their masses are two orders of magnitude smaller than the average Jeans mass (approximate estimate of the lower limit to the stellar mass given a density and temperature) in star-forming clouds. BUT … They are as numerous as 'normal' stars. The project: rationale:  The project: rationale So far, all the surveys for young BDs concentrate on the known star-formation regions (e.g Taurus-Auriga). Depending on the ejection velocity BDs may have travelled far from their birth sites and not revealed by the previously mentioned surveys. Check the ejection model by cross-correlating IPHAS and 2MASS to search young BD by their Hα emission and IR colors. IPHAS INT Photometric Hα survey (Drew’05) 1800 deg² -5andlt;bandlt;+5 r’, i’, H filters r’=20 (10 ), i’~19 80M sources in the Final Catalogue. The project: candidates and follow up:  The project: candidates and follow up Filtering using appropriate (r-Hα), (I-J), (J-H), (H-K) color criteria. (~ 300 candidates) Low resolution spectroscopic follow-up for a proper identification and determination of physical parameters. WHT: 2 nights (Aug 1st-2nd). 35 candidates observed. NOT/ALFOSC: 5 nights granted in Winter 06-07. Conclusions:  Conclusions The scarcity in the number of known brown dwarfs has a considerable impact on different fields of Astrophysics, in particular on the area of star formation. This problem has been identified as a key VO-Science case both by AstroGrid (included in the 'Top-Ten' cases) and EURO-VO (through its Science Reference Mission). Building a census of substellar objects implies the discovery of a statistically significant number of them through queries that combine attributes available from different archives. This is an approach out of the scope of the 'classical' methodology but that perfectly fits into the Virtual Observatory. The goal of this presentation has been to demonstrate the potential of carrying out this type of analysis in the VO framework. The observational evidences:  The observational evidences A high percentage of BDs found in Star Forming Regions show IR excesses  Existence of disks. Hα double peak  Indicator of accretion. Scenario compatible with a disk dissipation in a timescale similar to T Tauris. The theories: :  The theories: Photoerosion of prestellar cores (Whitworth andamp; Zinnecker, 2004): Turbulent fragmentation (Padoan andamp; Nordlund, 2004) Ejection (Reipurth andamp; Clarke, 2001)

Related presentations


Other presentations created by Techy_Guy

Character Analysis
04. 01. 2008
0 views

Character Analysis

Roosevelt and Latin America
22. 10. 2007
0 views

Roosevelt and Latin America

S10 Processor Performance
17. 09. 2007
0 views

S10 Processor Performance

Hawaiian Humpback Whale
17. 09. 2007
0 views

Hawaiian Humpback Whale

rainforest
02. 10. 2007
0 views

rainforest

Comvalid BGPsentinel
07. 10. 2007
0 views

Comvalid BGPsentinel

PETERPAN
10. 10. 2007
0 views

PETERPAN

across crocodile lake
11. 10. 2007
0 views

across crocodile lake

MLM basic info
12. 10. 2007
0 views

MLM basic info

VortragRichter
15. 10. 2007
0 views

VortragRichter

azerbaijan
15. 10. 2007
0 views

azerbaijan

ch02jjm
19. 10. 2007
0 views

ch02jjm

PRNAV Eurocontrol presentation
19. 10. 2007
0 views

PRNAV Eurocontrol presentation

Hakkarainen 091104
17. 09. 2007
0 views

Hakkarainen 091104

Extreme Ostrich2
17. 09. 2007
0 views

Extreme Ostrich2

Soy Protein in Baking
04. 10. 2007
0 views

Soy Protein in Baking

McMurrenTidbits
23. 10. 2007
0 views

McMurrenTidbits

Larijani stemcell ABA2007 Final
24. 10. 2007
0 views

Larijani stemcell ABA2007 Final

F Gauze
24. 10. 2007
0 views

F Gauze

TornadoSafetyAMS
07. 10. 2007
0 views

TornadoSafetyAMS

nii report
09. 10. 2007
0 views

nii report

NS102 3a S07 Fighting Sail
21. 10. 2007
0 views

NS102 3a S07 Fighting Sail

am0845 Khanna
16. 11. 2007
0 views

am0845 Khanna

culturechange
10. 12. 2007
0 views

culturechange

Jeopardy
29. 10. 2007
0 views

Jeopardy

masstheory
02. 11. 2007
0 views

masstheory

Finnish Chemicals information
21. 08. 2007
0 views

Finnish Chemicals information

zodiac
21. 08. 2007
0 views

zodiac

ICT Expo Presentation
21. 08. 2007
0 views

ICT Expo Presentation

words alive notes
21. 08. 2007
0 views

words alive notes

notes 13
21. 08. 2007
0 views

notes 13

200612011440150 ser mama
01. 10. 2007
0 views

200612011440150 ser mama

t5f2
07. 11. 2007
0 views

t5f2

PHYS 124 lt 2
13. 11. 2007
0 views

PHYS 124 lt 2

Localization days1 2
14. 11. 2007
0 views

Localization days1 2

Barlow
15. 11. 2007
0 views

Barlow

CEO breakfast Mar
16. 11. 2007
0 views

CEO breakfast Mar

SEVESO II 28 04 2003 d jansen
23. 11. 2007
0 views

SEVESO II 28 04 2003 d jansen

farawayplaces quiz
31. 10. 2007
0 views

farawayplaces quiz

lino hospitalstay 2005
28. 12. 2007
0 views

lino hospitalstay 2005

eno
05. 10. 2007
0 views

eno

Destinos Tradicionale
22. 10. 2007
0 views

Destinos Tradicionale

El Karib Hagmann 2001 HEKS ACORD
23. 10. 2007
0 views

El Karib Hagmann 2001 HEKS ACORD

Bioceramics
05. 01. 2008
0 views

Bioceramics

dennis
07. 01. 2008
0 views

dennis

DNR wetland benefits
07. 01. 2008
0 views

DNR wetland benefits

Norm Wright Presentation06
17. 09. 2007
0 views

Norm Wright Presentation06

Tudor Sports
21. 08. 2007
0 views

Tudor Sports

watson 2006
21. 08. 2007
0 views

watson 2006

IBM Presentation Roel Spee
24. 10. 2007
0 views

IBM Presentation Roel Spee

david simek
17. 09. 2007
0 views

david simek

75thWinter Silver
02. 08. 2007
0 views

75thWinter Silver

Revay Presentation
17. 09. 2007
0 views

Revay Presentation

week12 f03
17. 09. 2007
0 views

week12 f03

Ch12 ResolutionTheoremPro ving
17. 09. 2007
0 views

Ch12 ResolutionTheoremPro ving

INFOCOM99
05. 10. 2007
0 views

INFOCOM99

RoHS Presentation3 May
12. 10. 2007
0 views

RoHS Presentation3 May

Botany
07. 12. 2007
0 views

Botany

Week6February20 07
20. 02. 2008
0 views

Week6February20 07

Microcosmo Parte II
12. 10. 2007
0 views

Microcosmo Parte II

TSW
29. 02. 2008
0 views

TSW

HazMat Flow Study
26. 02. 2008
0 views

HazMat Flow Study

Vegetarian Nutrition 101
04. 03. 2008
0 views

Vegetarian Nutrition 101

White 10th Inter mountain
21. 08. 2007
0 views

White 10th Inter mountain

hondaimobil
02. 01. 2008
0 views

hondaimobil

Cfi
10. 03. 2008
0 views

Cfi

Timber Bridge Presentation
01. 01. 2008
0 views

Timber Bridge Presentation

carstenschymik
29. 12. 2007
0 views

carstenschymik

Ch 22 WB
07. 04. 2008
0 views

Ch 22 WB

Macroclean
10. 04. 2008
0 views

Macroclean

agingandwork
13. 04. 2008
0 views

agingandwork

nyBrazeau
14. 04. 2008
0 views

nyBrazeau

presentation total
16. 04. 2008
0 views

presentation total

3 Tufano2002
17. 04. 2008
0 views

3 Tufano2002

Chapter 18
18. 04. 2008
0 views

Chapter 18

Baltic states and Russia
12. 10. 2007
0 views

Baltic states and Russia

quotes
03. 10. 2007
0 views

quotes

WDR 2008
29. 11. 2007
0 views

WDR 2008

CHLA PSRS Overview
30. 04. 2008
0 views

CHLA PSRS Overview

15 UKernel
02. 05. 2008
0 views

15 UKernel

Mr Logan OCCAR
06. 03. 2008
0 views

Mr Logan OCCAR

shen
15. 10. 2007
0 views

shen

Industry Brief
22. 10. 2007
0 views

Industry Brief

sess 2 vollmer
18. 06. 2007
0 views

sess 2 vollmer

NSDI05 poster
18. 06. 2007
0 views

NSDI05 poster

NLC talk
18. 06. 2007
0 views

NLC talk

My Proxy GW06
18. 06. 2007
0 views

My Proxy GW06

my Master 4
18. 06. 2007
0 views

my Master 4

More Mosaics
18. 06. 2007
0 views

More Mosaics

MEM SPI Jan00
18. 06. 2007
0 views

MEM SPI Jan00

VCA Org Charts
11. 12. 2007
0 views

VCA Org Charts

cjdim com Boudchiche
23. 10. 2007
0 views

cjdim com Boudchiche

GA Conf06China1
25. 03. 2008
0 views

GA Conf06China1

lecture 7 deadlock
17. 09. 2007
0 views

lecture 7 deadlock

Neptune Presentation
15. 06. 2007
0 views

Neptune Presentation

neptune
15. 06. 2007
0 views

neptune

Mehregan
18. 06. 2007
0 views

Mehregan

Plants are very useful
15. 06. 2007
0 views

Plants are very useful

Learning Phonics
15. 06. 2007
0 views

Learning Phonics

Learning Percent III
15. 06. 2007
0 views

Learning Percent III

Learning Percent I
15. 06. 2007
0 views

Learning Percent I

Physical Education Procedures
15. 06. 2007
0 views

Physical Education Procedures

Penguins
15. 06. 2007
0 views

Penguins

Olympic Wax Museum
15. 06. 2007
0 views

Olympic Wax Museum

howe9
17. 09. 2007
0 views

howe9

GSantin Siena 2 SpaceTools
03. 01. 2008
0 views

GSantin Siena 2 SpaceTools

gunderia powerpointlab
26. 11. 2007
0 views

gunderia powerpointlab

MySQL UC solid DB xact
18. 06. 2007
0 views

MySQL UC solid DB xact

Civics Lecture
31. 12. 2007
0 views

Civics Lecture

Physics and psycho2
14. 02. 2008
0 views

Physics and psycho2

TOUREDIT
12. 03. 2008
0 views

TOUREDIT

harvard deas
03. 01. 2008
0 views

harvard deas

Angelology
01. 10. 2007
0 views

Angelology

HenryVIII wwtbam
21. 08. 2007
0 views

HenryVIII wwtbam

AGU 2002
03. 10. 2007
0 views

AGU 2002

RubÃn Blades
22. 10. 2007
0 views

RubÃn Blades

tran present
21. 08. 2007
0 views

tran present

BU01
17. 09. 2007
0 views

BU01

Thode
17. 09. 2007
0 views

Thode

PP R CAJAR
22. 10. 2007
0 views

PP R CAJAR

moore lightning uw05
17. 09. 2007
0 views

moore lightning uw05

Space- The Outside World
15. 06. 2007
0 views

Space- The Outside World

arts and humanities applications
22. 11. 2007
0 views

arts and humanities applications

Session9 CATHALAC UNDP
25. 10. 2007
0 views

Session9 CATHALAC UNDP

use sunscreen
17. 09. 2007
0 views

use sunscreen

aatom
20. 11. 2007
0 views

aatom

9681
02. 08. 2007
0 views

9681

HHDL
15. 10. 2007
0 views

HHDL