SlingshotprominencesevolutioninCoolStars

CAROLINAVILLARREALD’ANGELO,MOIRAJARDINE,ANDREWCOLLIERCAMERON,VICTORSEE&ROSEWAUGH

CoolStars20– Boston2018

ΩΩ Ω

Coolcondensationofmassco-rotatingwiththestar

• FirstseenonABDor(Collier-Cameron+1989,1990)• ΩAB Dor=0.5d• prominencelifetime=1-2d

Radialacceleration

2

H⍺intensity

-vsini vsiniVelocity

Coolcondensations

SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

3

Forcebalancetosupportprominences

• Materialwillaccumulateinapotentialminima(Ferreira+2000,Jardine+2001)

• Radialforcebalancemustoccur(CollierCameron+1989)

CentrifugalForce

Ω

RK RA

Enforcedco-rotation

MagneticTension

SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

Whereareslingshotprominencesfound?

CoolStars(VillarrealD’Angelo+2018)+Massivestars(Petit+2015)

RK < RA

RK > RA

Slingshot prominences

No slingshot prominences

4SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

Sun

ABDor

5

Whereareslingshotprominencesfound?

CoolStars(VillarrealD’Angelo+2018)+Massivestars(Petit+2015)

SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

Timeevolution?

Sun

ABDor

6

Oldersolarlikestarcan’tsupportprominences

SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

Sun

ABDor

7

AsolarlikestarwillhaveRk=RAwhenProt~6days

SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

Slowrotatorscan’tformprominences?

Ω%& ⟶ ~376Myr (50th)Ω%& ⟶ ~797Myr (90th)10thneverreachtheΩ%&

Johnstone+(2015)andTu+(2015)

100 101 102 103

Age [Myr]

100

101

102

⌦[⌦

�]

10th

50th

90thRk = RA

Slingshotprominences

NoslingshotprominencesSun

8SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

Ω%& = 4.6Ω⨀

Evolutionofprominencemass

𝜌0~𝐵2

4𝜋𝑅51

[Ω2𝑟 − 𝐺𝑀⋆/𝑟2]

100 101 102 103

Age [Myr]

1012

1013

1014

1015

1016

1017

1018

Pro

min

ence

mas

s[g

]

50th

90th

Max.massrange:[10@A − 10@B]g.

9

𝑚D ∝ 𝜌0

SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

VillarrealD’Angelo+2018a,2018b(inprep)

��D ∝ ��⋆

100 101 102 103

Age [Myr]

10�1

100

101

Pro

min

ence

lifet

ime

[day

s]

50th

90th

Evolutionofprominencelifetime

Max.ejectiontimerange:[1-14]days.

SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO 10

𝑡D =HI

HI

VillarrealD’Angelo+2018a,2018b(inprep)

100 101 102 103

Age [Myr]

1012

1013

1014

1015

1016

1017

1018

Pro

min

ence

mas

s[g

]

50th

90th

HKAqr (dM1.5)

Pz Tel(G6.5)

LQLup (G8IV)SpeedyMic(K3V) TWA6(K7)

V410Tau(K3)ABDor (K2V) Solarprominences

Prominenceobservedinabroadrangeofages!

100 101 102 103

Age [Myr]

10�1

100

101

Pro

min

ence

lifet

ime

[day

s]

50th

90th

11SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

ResumeSlingshotprominences:• Predictedmassesandlifetimesagreewithobservations.• PresentuntilthelateheavybombardmentforourSun.

Whydowecare:• Slingshotprominencecantracethecoronalstructure(poster 149).• Helpustoestimatethemasslossrateofthestar(poster149).• Dotheyinfluencetheevolutionofplanetaryatmosphere?.

12SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

THANKYOU!

13SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

0 20 40 60 80 100 120⌦[⌦�]

0

5

10

15

20

25

30

35

40

R[R

�]

Rk

RA

Rk = RA

Ω%& = 4.6Ω⨀

RK andRAasafunctionoftime

Rotationalevolutionmodelforasolarlikestar(Johnstone+2015)

Slingshotprominences

Time

14SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO

15

Prominencemodel

dA*dAm

dr

hm

𝑀D =J∗LM∗N

OP∗

M∗MQ

2𝐹 𝛻��, 𝛻𝜑 ,(�� = W

MQ)

��D =��∗4𝜋𝑅∗2

2𝑑𝐴∗

𝜏D =𝑀D

��D

(VillarrealD’Angelo+2018)

SLINGSHOTPROMINENCEEVOLUTIONINCOOLSTARS- CAROLINAVILLARREALD'ANGELO