High-resolution 8 mm and 1 cm polarization of IRAS 4A from the VLA Nascent Disk and Multiplicity (VANDAM) survey

Erin G. Cox, Robert J. Harris, Leslie W. Looney, Dominique M. Segura-Cox, John Tobin, Zhi Yun Li, Łukasz Tychoniec, Claire J. Chandler, Michael M. Dunham, Kaitlin Kratter, Carl Melis, Laura M. Perez, Sarah I. Sadavoy

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Magnetic fields can regulate disk formation, accretion, and jet launching. Until recently, it has been difficult to obtain high-resolution observations of the magnetic fields of the youngest protostars in the critical region near the protostar. The VANDAM survey is observing all known protostars in the Perseus Molecular Cloud. Here we present the polarization data of IRAS 4A. We find that with ∼0.″2 (50 AU) resolution at λ = 8.1 and 10.3 mm, the inferred magnetic field is consistent with a circular morphology, in marked contrast with the hourglass morphology seen on larger scales. This morphology is consistent with frozen-in field lines that were dragged in by rotating material entering the infall region. The field morphology is reminiscent of rotating circumstellar material near the protostar. This is the first polarization detection of a protostar at these wavelengths. We conclude from our observations that the dust emission is optically thin with β ∼ 1.3, suggesting that millimeter-/centimeter-sized grains have grown and survived in the short lifetime of the protostar.

Original languageEnglish (US)
Article numberL28
JournalAstrophysical Journal Letters
Volume814
Issue number2
DOIs
StatePublished - Dec 1 2015

Fingerprint

protostars
Infrared Astronomy Satellite
polarization
high resolution
magnetic field
magnetic fields
launching
accretion
dust
wavelength
molecular clouds
life (durability)
wavelengths
material

Keywords

  • circumstellar matter
  • stars: formation
  • stars: magnetic field

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Cox, E. G., Harris, R. J., Looney, L. W., Segura-Cox, D. M., Tobin, J., Li, Z. Y., ... Sadavoy, S. I. (2015). High-resolution 8 mm and 1 cm polarization of IRAS 4A from the VLA Nascent Disk and Multiplicity (VANDAM) survey. Astrophysical Journal Letters, 814(2), [L28]. https://doi.org/10.1088/2041-8205/814/2/L28

High-resolution 8 mm and 1 cm polarization of IRAS 4A from the VLA Nascent Disk and Multiplicity (VANDAM) survey. / Cox, Erin G.; Harris, Robert J.; Looney, Leslie W.; Segura-Cox, Dominique M.; Tobin, John; Li, Zhi Yun; Tychoniec, Łukasz; Chandler, Claire J.; Dunham, Michael M.; Kratter, Kaitlin; Melis, Carl; Perez, Laura M.; Sadavoy, Sarah I.

In: Astrophysical Journal Letters, Vol. 814, No. 2, L28, 01.12.2015.

Research output: Contribution to journalArticle

Cox, EG, Harris, RJ, Looney, LW, Segura-Cox, DM, Tobin, J, Li, ZY, Tychoniec, Ł, Chandler, CJ, Dunham, MM, Kratter, K, Melis, C, Perez, LM & Sadavoy, SI 2015, 'High-resolution 8 mm and 1 cm polarization of IRAS 4A from the VLA Nascent Disk and Multiplicity (VANDAM) survey', Astrophysical Journal Letters, vol. 814, no. 2, L28. https://doi.org/10.1088/2041-8205/814/2/L28
Cox, Erin G. ; Harris, Robert J. ; Looney, Leslie W. ; Segura-Cox, Dominique M. ; Tobin, John ; Li, Zhi Yun ; Tychoniec, Łukasz ; Chandler, Claire J. ; Dunham, Michael M. ; Kratter, Kaitlin ; Melis, Carl ; Perez, Laura M. ; Sadavoy, Sarah I. / High-resolution 8 mm and 1 cm polarization of IRAS 4A from the VLA Nascent Disk and Multiplicity (VANDAM) survey. In: Astrophysical Journal Letters. 2015 ; Vol. 814, No. 2.
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