Unraveling the brown dwarf desert: Four new discoveries and a
unifying period-coded picture

J 2026

Unraveling the brown dwarf desert: Four new discoveries and a unifying period-coded picture

SUBJAK, Jan; Rafael BRAHM; Jozef LIPTAK; Jan EBERHARDT; Marcelo TALA PINTO et al.

Základní údaje

Originální název

Unraveling the brown dwarf desert: Four new discoveries and a unifying period-coded picture

Autoři

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2026, 0004-6361

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 5.800 v roce 2024

Označené pro přenos do RIV

Ano

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

techniques: photometric; techniques: radial velocities; techniques: spectroscopic; planets and satellites: formation; planet-disk interactions; brown dwarfs

Štítky

14312040

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 16. 7. 2026 12:31, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

We present four newly validated transiting brown dwarfs identified through TESS photometry and confirmed with high-precision radial velocity measurements obtained from the FEROS and PLATOSpec spectrographs. Notably, three of these companions exhibit orbital periods exceeding 100 days, thereby expanding the sample of long-period transiting brown dwarfs from four to seven systems. The host stars of the long-period brown dwarfs show mild subsolar metallicity. These discoveries highlight the expansion of the metal-poor long-period distribution and help us better understand the brown dwarf desert. In our comparative analysis of eccentricity and metallicity demographics, we utilized catalogs of long-period giant planets, brown dwarfs, and low-mass stellar companions. After accounting for tidal influences, the eccentricity distribution aligns with that of low-mass stellar binaries, presenting a different profile than that observed within the giant planet population. Additionally, the metallicity of the host stars reveals a noteworthy trend: Short-period transiting brown dwarfs are predominantly associated with metal-rich stars, whereas long-period brown dwarfs are more often found around metal-poor stars, thus demonstrating statistical similarities to low-mass stellar hosts. This trend has been previously observed in studies of hot and cold Jupiters and points to a period-coded mixture of channels. A natural explanation is that most brown dwarfs originate from fragmentation at wider separations, with long-period systems retaining this stellar-like imprint, while only those embedded in massive, long-lived metal-rich protoplanetary disks are efficiently delivered and stabilized to short orbits.

Přiložené soubory

2576818.pdf

Požádat o autorskou verzi souboru

Citovat

SUBJAK, Jan; Rafael BRAHM; Jozef LIPTAK; Jan EBERHARDT; Marcelo TALA PINTO; Sarah L. CASEWELL; Thomas HENNING; Katharine HESSE; Trifon TRIFONOV; Andres JORDAN; Felipe I. ROJAS; Michaela VÍTKOVÁ; Helem SALINAS; Gavin BOYLE; Vincent SUC; Luca ANTONUCCI; Krzysztof BERNACKI; Cesar BRICENO; Karen A. COLLINS; Jorge FERNANDEZ FERNANDEZ; Samuel GILL; Jan JANÍK; Nicholas LAW; Andrew W. MANN; James MCCORMAC; Adam POPOWICZ; Daniel SEBASTIAN; Marek SKARKA; Jan VACLAVIK; Leonardo VANZI; Richard G. WEST; Francis P. WILKIN a Carl ZIEGLER. Unraveling the brown dwarf desert: Four new discoveries and a unifying period-coded picture. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2026, roč. 709, May, s. 1-20. ISSN 0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/202558244.

@article{2576818,
   author = {Subjak, Jan and Brahm, Rafael and Liptak, Jozef and Eberhardt, Jan and Tala Pinto, Marcelo and Casewell, Sarah L. and Henning, Thomas and Hesse, Katharine and Trifonov, Trifon and Jordan, Andres and Rojas, Felipe I. and Vítková, Michaela and Salinas, Helem and Boyle, Gavin and Suc, Vincent and Antonucci, Luca and Bernacki, Krzysztof and Briceno, Cesar and Collins, Karen A. and Fernandez Fernandez, Jorge and Gill, Samuel and Janík, Jan and Law, Nicholas and Mann, Andrew W. and McCormac, James and Popowicz, Adam and Sebastian, Daniel and Skarka, Marek and Vaclavik, Jan and Vanzi, Leonardo and West, Richard G. and Wilkin, Francis P. and Ziegler, Carl},
   article_location = {LES ULIS CEDEX A},
   article_number = {May},
   doi = {https://doi.org/10.1051/0004-6361/202558244},
   keywords = {techniques: photometric; techniques: radial velocities; techniques: spectroscopic; planets and satellites: formation; planet-disk interactions; brown dwarfs},
   language = {eng},
   issn = {0004-6361},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {Unraveling the brown dwarf desert: Four new discoveries and a unifying period-coded picture},
   url = {https://www.aanda.org/articles/aa/pdf/2026/05/aa58244-25.pdf},
   volume = {709},
   year = {2026}
}

TY  - JOUR
ID  - 2576818
AU  - Subjak, Jan - Brahm, Rafael - Liptak, Jozef - Eberhardt, Jan - Tala Pinto, Marcelo - Casewell, Sarah L. - Henning, Thomas - Hesse, Katharine - Trifonov, Trifon - Jordan, Andres - Rojas, Felipe I. - Vítková, Michaela - Salinas, Helem - Boyle, Gavin - Suc, Vincent - Antonucci, Luca - Bernacki, Krzysztof - Briceno, Cesar - Collins, Karen A. - Fernandez Fernandez, Jorge - Gill, Samuel - Janík, Jan - Law, Nicholas - Mann, Andrew W. - McCormac, James - Popowicz, Adam - Sebastian, Daniel - Skarka, Marek - Vaclavik, Jan - Vanzi, Leonardo - West, Richard G. - Wilkin, Francis P. - Ziegler, Carl
PY  - 2026
TI  - Unraveling the brown dwarf desert: Four new discoveries and a unifying period-coded picture
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 709
IS  - May
SP  - 1-20
EP  - 1-20
PB  - EDP SCIENCES S A
SN  - 00046361
KW  - techniques: photometric
KW  - techniques: radial velocities
KW  - techniques: spectroscopic
KW  - planets and satellites: formation
KW  - planet-disk interactions
KW  - brown dwarfs
UR  - https://www.aanda.org/articles/aa/pdf/2026/05/aa58244-25.pdf
N2  - We present four newly validated transiting brown dwarfs identified through TESS photometry and confirmed with high-precision radial velocity measurements obtained from the FEROS and PLATOSpec spectrographs. Notably, three of these companions exhibit orbital periods exceeding 100 days, thereby expanding the sample of long-period transiting brown dwarfs from four to seven systems. The host stars of the long-period brown dwarfs show mild subsolar metallicity. These discoveries highlight the expansion of the metal-poor long-period distribution and help us better understand the brown dwarf desert. In our comparative analysis of eccentricity and metallicity demographics, we utilized catalogs of long-period giant planets, brown dwarfs, and low-mass stellar companions. After accounting for tidal influences, the eccentricity distribution aligns with that of low-mass stellar binaries, presenting a different profile than that observed within the giant planet population. Additionally, the metallicity of the host stars reveals a noteworthy trend: Short-period transiting brown dwarfs are predominantly associated with metal-rich stars, whereas long-period brown dwarfs are more often found around metal-poor stars, thus demonstrating statistical similarities to low-mass stellar hosts. This trend has been previously observed in studies of hot and cold Jupiters and points to a period-coded mixture of channels. A natural explanation is that most brown dwarfs originate from fragmentation at wider separations, with long-period systems retaining this stellar-like imprint, while only those embedded in massive, long-lived metal-rich protoplanetary disks are efficiently delivered and stabilized to short orbits.
ER  -

SUBJAK, Jan; Rafael BRAHM; Jozef LIPTAK; Jan EBERHARDT; Marcelo TALA PINTO; Sarah L. CASEWELL; Thomas HENNING; Katharine HESSE; Trifon TRIFONOV; Andres JORDAN; Felipe I. ROJAS; Michaela VÍTKOVÁ; Helem SALINAS; Gavin BOYLE; Vincent SUC; Luca ANTONUCCI; Krzysztof BERNACKI; Cesar BRICENO; Karen A. COLLINS; Jorge FERNANDEZ FERNANDEZ; Samuel GILL; Jan JANÍK; Nicholas LAW; Andrew W. MANN; James MCCORMAC; Adam POPOWICZ; Daniel SEBASTIAN; Marek SKARKA; Jan VACLAVIK; Leonardo VANZI; Richard G. WEST; Francis P. WILKIN a Carl ZIEGLER. Unraveling the brown dwarf desert: Four new discoveries and a unifying period-coded picture. \textit{ASTRONOMY \&{} ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2026, roč.~709, May, s.~1-20. ISSN~0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/202558244.

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