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History of Globulettes in the Milky Way
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-4932-7851
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-4400-3276
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-1564-870X
2018 (English)In: Astrophysics and Space Science, ISSN 0004-640X, E-ISSN 1572-946X, Vol. 363, no 2, article id 28Article in journal (Refereed) Published
Abstract [en]

Globulettes are small (radii $< 10$ kAU) dark dust clouds, seen against the background of bright nebulae.

A majority of the objects have planetary mass.

These objects may be a source of brown dwarfs and free floating planetary mass objects in the galaxy.

In this paper we investigate how many globulettes could have formed in the Milky Way and how they could contribute to the total population of free floating planets.

In order to do that we examine H-alpha images of 27 H~II regions. In these images, we find 778 globulettes.

We find that a conservative value of the number of globulettes formed is $5.7\times 10^{10}$.

If 10 \% of the globulettes form free floating planets then they have contributed with $5.7\times 10^{9}$ free floating planets in the Milky Way. A less conservative number of globulettes would mean that the globulettes could contribute $2.0\times 10^{10}$ free floating planets.

Thus the globulettes could represent a non-negligible source of free floating planets in the Milky Way.

Place, publisher, year, edition, pages
2018. Vol. 363, no 2, article id 28
Keyword [en]
Free Floating Planets; Globulettes; H II Regions; ISM; Milky Way
National Category
Astronomy, Astrophysics and Cosmology Other Physics Topics Energy Engineering
Research subject
Applied Physics; Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-67161DOI: 10.1007/s10509-017-3233-6ISI: 000424039100002Scopus ID: 2-s2.0-85040453332OAI: oai:DiVA.org:ltu-67161DiVA, id: diva2:1170838
Note

Validerad;2018;Nivå 2;2018-01-23 (andbra)

Available from: 2018-01-04 Created: 2018-01-04 Last updated: 2018-05-02Bibliographically approved
In thesis
1. Dusty Globules and Globulettes
Open this publication in new window or tab >>Dusty Globules and Globulettes
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2018
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Physical Sciences Other Physics Topics
Research subject
Applied Physics
Identifiers
urn:nbn:se:ltu:diva-68252 (URN)978-91-7790-092-4 (ISBN)978-91-7790-093-1 (ISBN)
Public defence
2018-06-19, 10:00
Available from: 2018-04-10 Created: 2018-04-09 Last updated: 2018-05-17Bibliographically approved

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