Probing changes of dust properties along a chain of solar-type prestellar and protostellar cores in Taurus with NIKA

A. Bracco, P. Palmeirim, P. André, R. Adam, P. Ade, A. Bacmann, A. Beelen, A. Benoît, A. Bideaud, N. Billot, O. Bourrion, M. Calvo, A. Catalano, G. Coiffard, B. Comis, A. D'addabbo, F. X. Désert, P. Didelon, S. Doyle, J. GoupyV. Könyves, C. Kramer, G. Lagache, S. Leclercq, J. F. Macías-Pérez, A. Maury, Philip Mauskopf, F. Mayet, A. Monfardini, F. Motte, F. Pajot, E. Pascale, N. Peretto, L. Perotto, G. Pisano, N. Ponthieu, V. Revéret, A. Rigby, A. Ritacco, L. Rodriguez, C. Romero, A. Roy, F. Ruppin, K. Schuster, A. Sievers, S. Triqueneaux, C. Tucker, R. Zylka

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The characterization of dust properties in the interstellar medium is key for understanding the physics and chemistry of star formation. Mass estimates are crucial to determine gravitational collapse conditions for the birth of new stellar objects in molecular clouds. However, most of these estimates rely on dust models that need further observational constraints to capture the relevant parameter variations depending on the local environment: From clouds to prestellar and protostellar cores. We present results of a new study of dust emissivity changes based on millimeter continuum data obtained with the NIKA camera at the IRAM-30 m telescope. Observing dust emission at 1.15 mm and 2 mm allows us to constrain the dust emissivity index, β, in the Rayleigh-Jeans tail of the dust spectral energy distribution far from its peak emission, where the contribution of other parameters (i.e. dust temperature) is more important. Focusing on the Taurus molecular cloud, one of the most famous low-mass star-forming regions in the Gould Belt, we analyze the emission properties of several distinct objects in the B213 filament. This subparsec-sized region is of particular interest since it is characterized by a collection ofevolutionary stages of early star formation: Three prestellar cores, two Class 0/I protostellar cores and one Class II object. We are therefore able to compare dust properties among a sequence of sources that likely derive from the same parent filament. By means of the ratio of the two NIKA channel maps, we show that in the Rayleigh-Jeans approximation, βRJ varies among the objects: It decreases from prestellar cores (βRJ ∼ 2) to protostellar cores (βRJ ∼ 1) and the Class II object (βRJ ∼ 0). For one prestellar and two protostellar cores, we produce a robust study using available Herschel data to constrain the dust temperature of the sources. By using the Abel transform inversion technique we derive accurate radial temperature profiles that allow us to obtain radial β profiles. We find systematic spatial variations of β in the protostellar cores that are not observed in the prestellar core. While in the former case β decreases toward the center (with β varying between 1 and 2), in the latter it remains constant (β = 2.4 ± 0.3). Moreover, the dust emissivity index appears anticorrelated with the dust temperature. We discuss the implication of these results in terms of dust grain evolution between pre- and protostellar cores.

Original languageEnglish (US)
Article number31117
JournalAstronomy and Astrophysics
Volume604
DOIs
StatePublished - Aug 1 2017

Fingerprint

dust
emissivity
molecular clouds
star formation
filaments
early stars
gravitational collapse
temperature
estimates
spectral energy distribution
temperature profile
temperature profiles
transform
physics
spatial variation
cameras
telescopes
chemistry
inversions
continuums

Keywords

  • Dust, extinction
  • ISM: Structure
  • Stars: Formation
  • Stars: Protostars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Probing changes of dust properties along a chain of solar-type prestellar and protostellar cores in Taurus with NIKA. / Bracco, A.; Palmeirim, P.; André, P.; Adam, R.; Ade, P.; Bacmann, A.; Beelen, A.; Benoît, A.; Bideaud, A.; Billot, N.; Bourrion, O.; Calvo, M.; Catalano, A.; Coiffard, G.; Comis, B.; D'addabbo, A.; Désert, F. X.; Didelon, P.; Doyle, S.; Goupy, J.; Könyves, V.; Kramer, C.; Lagache, G.; Leclercq, S.; Macías-Pérez, J. F.; Maury, A.; Mauskopf, Philip; Mayet, F.; Monfardini, A.; Motte, F.; Pajot, F.; Pascale, E.; Peretto, N.; Perotto, L.; Pisano, G.; Ponthieu, N.; Revéret, V.; Rigby, A.; Ritacco, A.; Rodriguez, L.; Romero, C.; Roy, A.; Ruppin, F.; Schuster, K.; Sievers, A.; Triqueneaux, S.; Tucker, C.; Zylka, R.

In: Astronomy and Astrophysics, Vol. 604, 31117, 01.08.2017.

Research output: Contribution to journalArticle

Bracco, A, Palmeirim, P, André, P, Adam, R, Ade, P, Bacmann, A, Beelen, A, Benoît, A, Bideaud, A, Billot, N, Bourrion, O, Calvo, M, Catalano, A, Coiffard, G, Comis, B, D'addabbo, A, Désert, FX, Didelon, P, Doyle, S, Goupy, J, Könyves, V, Kramer, C, Lagache, G, Leclercq, S, Macías-Pérez, JF, Maury, A, Mauskopf, P, Mayet, F, Monfardini, A, Motte, F, Pajot, F, Pascale, E, Peretto, N, Perotto, L, Pisano, G, Ponthieu, N, Revéret, V, Rigby, A, Ritacco, A, Rodriguez, L, Romero, C, Roy, A, Ruppin, F, Schuster, K, Sievers, A, Triqueneaux, S, Tucker, C & Zylka, R 2017, 'Probing changes of dust properties along a chain of solar-type prestellar and protostellar cores in Taurus with NIKA', Astronomy and Astrophysics, vol. 604, 31117. https://doi.org/10.1051/0004-6361/201731117
Bracco, A. ; Palmeirim, P. ; André, P. ; Adam, R. ; Ade, P. ; Bacmann, A. ; Beelen, A. ; Benoît, A. ; Bideaud, A. ; Billot, N. ; Bourrion, O. ; Calvo, M. ; Catalano, A. ; Coiffard, G. ; Comis, B. ; D'addabbo, A. ; Désert, F. X. ; Didelon, P. ; Doyle, S. ; Goupy, J. ; Könyves, V. ; Kramer, C. ; Lagache, G. ; Leclercq, S. ; Macías-Pérez, J. F. ; Maury, A. ; Mauskopf, Philip ; Mayet, F. ; Monfardini, A. ; Motte, F. ; Pajot, F. ; Pascale, E. ; Peretto, N. ; Perotto, L. ; Pisano, G. ; Ponthieu, N. ; Revéret, V. ; Rigby, A. ; Ritacco, A. ; Rodriguez, L. ; Romero, C. ; Roy, A. ; Ruppin, F. ; Schuster, K. ; Sievers, A. ; Triqueneaux, S. ; Tucker, C. ; Zylka, R. / Probing changes of dust properties along a chain of solar-type prestellar and protostellar cores in Taurus with NIKA. In: Astronomy and Astrophysics. 2017 ; Vol. 604.
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abstract = "The characterization of dust properties in the interstellar medium is key for understanding the physics and chemistry of star formation. Mass estimates are crucial to determine gravitational collapse conditions for the birth of new stellar objects in molecular clouds. However, most of these estimates rely on dust models that need further observational constraints to capture the relevant parameter variations depending on the local environment: From clouds to prestellar and protostellar cores. We present results of a new study of dust emissivity changes based on millimeter continuum data obtained with the NIKA camera at the IRAM-30 m telescope. Observing dust emission at 1.15 mm and 2 mm allows us to constrain the dust emissivity index, β, in the Rayleigh-Jeans tail of the dust spectral energy distribution far from its peak emission, where the contribution of other parameters (i.e. dust temperature) is more important. Focusing on the Taurus molecular cloud, one of the most famous low-mass star-forming regions in the Gould Belt, we analyze the emission properties of several distinct objects in the B213 filament. This subparsec-sized region is of particular interest since it is characterized by a collection ofevolutionary stages of early star formation: Three prestellar cores, two Class 0/I protostellar cores and one Class II object. We are therefore able to compare dust properties among a sequence of sources that likely derive from the same parent filament. By means of the ratio of the two NIKA channel maps, we show that in the Rayleigh-Jeans approximation, βRJ varies among the objects: It decreases from prestellar cores (βRJ ∼ 2) to protostellar cores (βRJ ∼ 1) and the Class II object (βRJ ∼ 0). For one prestellar and two protostellar cores, we produce a robust study using available Herschel data to constrain the dust temperature of the sources. By using the Abel transform inversion technique we derive accurate radial temperature profiles that allow us to obtain radial β profiles. We find systematic spatial variations of β in the protostellar cores that are not observed in the prestellar core. While in the former case β decreases toward the center (with β varying between 1 and 2), in the latter it remains constant (β = 2.4 ± 0.3). Moreover, the dust emissivity index appears anticorrelated with the dust temperature. We discuss the implication of these results in terms of dust grain evolution between pre- and protostellar cores.",
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TY - JOUR

T1 - Probing changes of dust properties along a chain of solar-type prestellar and protostellar cores in Taurus with NIKA

AU - Bracco, A.

AU - Palmeirim, P.

AU - André, P.

AU - Adam, R.

AU - Ade, P.

AU - Bacmann, A.

AU - Beelen, A.

AU - Benoît, A.

AU - Bideaud, A.

AU - Billot, N.

AU - Bourrion, O.

AU - Calvo, M.

AU - Catalano, A.

AU - Coiffard, G.

AU - Comis, B.

AU - D'addabbo, A.

AU - Désert, F. X.

AU - Didelon, P.

AU - Doyle, S.

AU - Goupy, J.

AU - Könyves, V.

AU - Kramer, C.

AU - Lagache, G.

AU - Leclercq, S.

AU - Macías-Pérez, J. F.

AU - Maury, A.

AU - Mauskopf, Philip

AU - Mayet, F.

AU - Monfardini, A.

AU - Motte, F.

AU - Pajot, F.

AU - Pascale, E.

AU - Peretto, N.

AU - Perotto, L.

AU - Pisano, G.

AU - Ponthieu, N.

AU - Revéret, V.

AU - Rigby, A.

AU - Ritacco, A.

AU - Rodriguez, L.

AU - Romero, C.

AU - Roy, A.

AU - Ruppin, F.

AU - Schuster, K.

AU - Sievers, A.

AU - Triqueneaux, S.

AU - Tucker, C.

AU - Zylka, R.

PY - 2017/8/1

Y1 - 2017/8/1

N2 - The characterization of dust properties in the interstellar medium is key for understanding the physics and chemistry of star formation. Mass estimates are crucial to determine gravitational collapse conditions for the birth of new stellar objects in molecular clouds. However, most of these estimates rely on dust models that need further observational constraints to capture the relevant parameter variations depending on the local environment: From clouds to prestellar and protostellar cores. We present results of a new study of dust emissivity changes based on millimeter continuum data obtained with the NIKA camera at the IRAM-30 m telescope. Observing dust emission at 1.15 mm and 2 mm allows us to constrain the dust emissivity index, β, in the Rayleigh-Jeans tail of the dust spectral energy distribution far from its peak emission, where the contribution of other parameters (i.e. dust temperature) is more important. Focusing on the Taurus molecular cloud, one of the most famous low-mass star-forming regions in the Gould Belt, we analyze the emission properties of several distinct objects in the B213 filament. This subparsec-sized region is of particular interest since it is characterized by a collection ofevolutionary stages of early star formation: Three prestellar cores, two Class 0/I protostellar cores and one Class II object. We are therefore able to compare dust properties among a sequence of sources that likely derive from the same parent filament. By means of the ratio of the two NIKA channel maps, we show that in the Rayleigh-Jeans approximation, βRJ varies among the objects: It decreases from prestellar cores (βRJ ∼ 2) to protostellar cores (βRJ ∼ 1) and the Class II object (βRJ ∼ 0). For one prestellar and two protostellar cores, we produce a robust study using available Herschel data to constrain the dust temperature of the sources. By using the Abel transform inversion technique we derive accurate radial temperature profiles that allow us to obtain radial β profiles. We find systematic spatial variations of β in the protostellar cores that are not observed in the prestellar core. While in the former case β decreases toward the center (with β varying between 1 and 2), in the latter it remains constant (β = 2.4 ± 0.3). Moreover, the dust emissivity index appears anticorrelated with the dust temperature. We discuss the implication of these results in terms of dust grain evolution between pre- and protostellar cores.

AB - The characterization of dust properties in the interstellar medium is key for understanding the physics and chemistry of star formation. Mass estimates are crucial to determine gravitational collapse conditions for the birth of new stellar objects in molecular clouds. However, most of these estimates rely on dust models that need further observational constraints to capture the relevant parameter variations depending on the local environment: From clouds to prestellar and protostellar cores. We present results of a new study of dust emissivity changes based on millimeter continuum data obtained with the NIKA camera at the IRAM-30 m telescope. Observing dust emission at 1.15 mm and 2 mm allows us to constrain the dust emissivity index, β, in the Rayleigh-Jeans tail of the dust spectral energy distribution far from its peak emission, where the contribution of other parameters (i.e. dust temperature) is more important. Focusing on the Taurus molecular cloud, one of the most famous low-mass star-forming regions in the Gould Belt, we analyze the emission properties of several distinct objects in the B213 filament. This subparsec-sized region is of particular interest since it is characterized by a collection ofevolutionary stages of early star formation: Three prestellar cores, two Class 0/I protostellar cores and one Class II object. We are therefore able to compare dust properties among a sequence of sources that likely derive from the same parent filament. By means of the ratio of the two NIKA channel maps, we show that in the Rayleigh-Jeans approximation, βRJ varies among the objects: It decreases from prestellar cores (βRJ ∼ 2) to protostellar cores (βRJ ∼ 1) and the Class II object (βRJ ∼ 0). For one prestellar and two protostellar cores, we produce a robust study using available Herschel data to constrain the dust temperature of the sources. By using the Abel transform inversion technique we derive accurate radial temperature profiles that allow us to obtain radial β profiles. We find systematic spatial variations of β in the protostellar cores that are not observed in the prestellar core. While in the former case β decreases toward the center (with β varying between 1 and 2), in the latter it remains constant (β = 2.4 ± 0.3). Moreover, the dust emissivity index appears anticorrelated with the dust temperature. We discuss the implication of these results in terms of dust grain evolution between pre- and protostellar cores.

KW - Dust, extinction

KW - ISM: Structure

KW - Stars: Formation

KW - Stars: Protostars

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